Rim process for the production of elastic moldings

Claim 2

In a process for the production of polyurethane elastomer moldings having a compact surface skin from a reaction mixture by a reaction injection molding process, wherein said reaction mixture comprises the following components: (a) 4,4'-diisocyanatodiphenylmethane,polyisocyanates based on 4,4'-diisocyanatodiphenylmethane or mixtures thereof; (b) hydroxyl group containing compounds having molecular weights of from 1800 to 12,000; (c) a chain extender; and (d) a catalyst for the reaction between hydroxyl groups and isocyanate groups; the improvement wherein said chain extender is miscible with component (b) in any proportion and is an active aromatic diamine having alkyl groups of from 1 to 3 carbon atoms in the ortho-positions to each amino group, and wherein said components are processed via the one-shot process whereby (a) is mixed simultaneously either with (b), (c), and (d) or with a non-reacted premixture of some or all of (b), (c), and (d) or with a non-reacted premixture of some or all of (b), (c) and (d), with the proviso that at least two of said alkyl substituents contain 2 or 3 carbon atoms.

Claim 3

The process of claim 1, wherein the reaction mixture also contains a blowing agent and wherein said moldings are further characterized as having a cellular core.

Claim 4

The process of claim 1, wherein said chain extender contains at least one linear alkyl substituent in the ortho-position to a first amino group and two linear alkyl substituents in the ortho-position to a second amino group, and wherein said chain extender is either in liquid form or is dissolved in said hydroxyl group containing compound.

Claim 5

The process of claim 1, wherein said chain extender is selected from the group consisting of 1-methyl-3,5-diethyl-2,4-diamino benzene; 1-methyl-3,5-diethyl-2,6-diamino benzene; 1,3,5-triethyl-2,6-diamino benzene; 3,5,3',5'-tetraethyl-4,4'-diaminodiphenyl methane; and mixtures thereof.

Claim 6

The process of claim 4, wherein said chain extender is selected from the group consisting of 1-methyl-3,5-diethyl-2,4-diamino benzene; 1-methyl-3,5-diethyl-2,6-diaminobenzene; and mixtures thereof.

Claim 7

The process of claim 1, wherein (i) component (c) comprises from 5 to 50 percent by weight based on the total weight of component (b); (ii) component (d) comprises from 0.01 to 10 percent by weight based on the total weight of component (b); and (iii) the amount of component (a) is such that said reaction mixture has an isocyanate index of from 70 to 130.

Claim 8

The process of claim 6, wherein (i) component (c) comprises from 5 to 35 percent by weight based on the total weight of component (b); (ii) component (d) comprises from 0.05 to 1 percent by weight based on the total weight of component (b); and (iii) the amount of component (a) is such that said reaction mixture has an isocyanate index of

Claim 9

The process of claim 1, wherein said hydroxyl group containing compound is selected from the group consisting of polyethers, polyesters, polythioethers, polyacetals, polycarbonates, polyester amides and mixtures thereof.

Claim 10

The process of claim 1, wherein said hydroxyl group containing compound is a polyhydroxyl polyether having at least two hydroxyl groups.

Claim 11

The process of claim 9, wherein said polyether has a molecular weight of from 3,000 to 7,000 and contains 3 hydroxyl groups.

Claim 12

The process of claim 1, wherein said catalyst is selected such that said reaction mixture has a flow time of less than 15 seconds.

Claim 13

The process of claim 11, wherein said catalyst is selected such that said reaction mixture has a flow time of less than 10 seconds.

Claim 14

The process of claim 12, wherein said catalyst is selected such that said reaction mixture has a flow time of less than 5 seconds.

Claim 15

The process of claim 1, wherein said polyisocyanates based on 4,4'-diisocyanatodiphenylmethane are liquid at room temperature.

Claim 16

An active hydrogen containing blend for use in the production of polyurethane moldings comprising: (a) an organic hydroxyl group containing compound having a molecular weight of from 1,800 to 12,000, and (b) a chain extender which is miscible with polyhydroxyl compounds in any proportion and is selected from the group consisting of active aromatic diamines, having alkyl groups of from 1 to 3 carbon atoms in the ortho-position to each amino group, with the proviso that at least two of said alkyl substituents contain 2 or 3 carbon atoms.

Claim 17

An active hydrogen containing blend for use in the production of polyurethane moldings comprising: (a) an organic hydroxyl group containing compound having a molecular weight of from 1,800 to 12,000, and (b) a chain extender which is miscible with polyhydroxyl compounds in any proportion and is selected from the group consisting of active aromatic diamines, having alkyl groups of from 1 to 3 carbon atoms in the ortho-position to each amino group, with the proviso that at least two of said alkyl substituents contain 2 or 3 carbon atoms.

Claim 18

The composition of claim 15, wherein said blend also contains a catalyst for reaction between hydroxyl groups and isocyanate groups.

Claim 19

The composition of claim 15, wherein said chain extender contains at least one linear alkyl substituent in the ortho-position to a first amino group and two linear alkyl substituents in the ortho-position to a second amino group.

Claim 20

The composition of claim 15, wherein said chain extender is selected from the group consisting of 1-methyl-3,5-diethyl-2,4-diamino benzene; 1-methyl-3,5-diethyl-2,6-diamino benzene; 1,3,5-triethyl-2,6-diamino benzene; 3,5,3',5'-tetraethyl-4,4'-diaminodiphenyl methane; and mixtures thereof.

Claim 21

The composition of claim 18, wherein said chain extender is selected from the group consisting of 1-methyl-3,5-diethyl-2,4-diaminobenzene, 1-methyl-3,5-diethyl-2,6-diaminobenzene, and mixtures thereof.

Claim 22

The composition of claim 15, wherein said chain extender comprises from 5 to 50 percent by weight based on the total weight of said hydroxyl group containing compound.

Claim 23

The composition of claim 20, wherein said chain extender comprises from 5 to 35 percent by weight based on the total weight of said hydroxyl group containing compound.

Claim 24

The composition of claim 15, wherein said polyhydroxyl compound is selected from the group consisting of polyethers, polyesters, polythioethers, polyacetals, polycarbonates, polyester amides and mixtures thereof.

Claim 25

The composition of claim 15, wherein said hydroxyl group containing compound is a polyhydroxyl polyether having at least two hydroxyl groups.

Claim 26

The composition of claim 23, wherein said polyether has a molecular weight of from 3,000 to 7,000 and contains 3 hydroxyl groups.

Claim 27

In a process for the production of polyurethane elastomer moldings having a compact surface from a reaction mixture by a reaction injection molding process, wherein said reaction mixture comprises the following components: (a) 4,4'-diisocyanatodiphenylmethane, polyisocyanates based on 4,4'-diisocyanatodiphenylmethane or mixtures thereof; (b) hydroxyl group containing compounds; (c) a chain extender; and (d) a catalyst for the reaction between hydroxyl groups and isocyanate groups; the improvement wherein said chain extender is miscible with polyhydroxyl compounds in any proportion and is selected from the group consisting of active aromatic diamines, which contain at least one alkyl substituent in the ortho-position to a first amino group and two alkyl substituents in the ortho-position to a second amino group, or mixtures thereof, with the proviso that at least two of said alkyl substituents contain at least two carbon atoms, and where said components (a), (b), (c) and (d) are processed via the one-shot process whereby (a) is mixed simultaneously either with (b), (c) and (d) or with a non-reacted premixture of some or all of (b), (c), and (d).

Claim 28

In a process for the production of polyurethane elastomer moldings having a compact surface from a reaction mixture by a reaction injection molding process, wherein said reaction mixture comprises the following components: (a) 4,4'-diisocyanatodiphenylmethane, polyisocyanates based on 4,4'-diisocyanatodiphenylmethane or mixtures thereof; (b) hydroxyl group containing compounds; (c) a chain extender; and (d) a catalyst for the reaction between hydroxyl groups and isocyanate groups; the improvement wherein said chain extender is miscible with polyhydroxyl compounds in any proportion and is selected from the group consisting of active aromatic diamines, which contain at least one alkyl substituent in the ortho-position to a first amino group and two alkyl substituents in the ortho-position to a second amino group, or mixtures thereof, with the proviso that at least two of said alkyl substituents contain at least two carbon atoms, and where said components (a), (b), (c) and (d) are processed via the one-shot process whereby (a) is mixed simultaneously either with (b), (c) and (d) or with a non-reacted premixture of some or all of (b), (c), and (d).

Claim 29

The process of claim 25, wherein said reaction mixture contains no blowing agent.

Claim 30

The process of claim 26, wherein said chain extender is selected from the group consisting of 1-methyl-3,5-diethyl-2,4-diamino benzene; 1-methyl-3,5-diethyl-2,6-diamino-benzene; and mixtures thereof.

Claim 31

The process of claim 25, wherein said reaction mixture also contains a blowing agent and wherein said moldings are further characterized as having a cellular core.

Claim 32

The process of claim 25, wherein said chain extender has linear alkyl substituents of 2 or 3 carbon atoms in both ortho-positions to each amino group.

Claim 33

The process of claim 29, wherein said chain extender is either in liquid form or is dissolved in said hydroxyl group containing compound.

Claim 34

The process of claim 25, wherein said polyisocyanates based on 4,4'-diisocyanatodiphenylmethane are liquid at room temperature.

Claim 35

The process of claim 25, wherein (i) component (c) comprises from 5 to 50 percent by weight based on the total weight of component (b); (ii) component (d) comprises from 0.01 to 10 percent by weight based on the total weight of component (b); and (iii) the amount of component (a) is such that said reaction mixture has an isocyanate index of from 70 to 130.

Claim 36

The process of claim 32, wherein (i) component (c) comprises from 5 to 35 percent by weight based on the total weight of component (b); (ii) component (d) comprises from 0.05 to 1 percent by weight based on the total weight of component (b); and (iii) the amount of component (a) is such that said reaction mixture has an isocyanate index of from 90 to 110.

Claim 37

The process of claim 25, wherein said hydroxyl group containing compound is selected from the group consisting of polyethers, polyesters, polythioethers, polyacetals, polycarbonates, polyester amides and mixtures thereof.

Claim 38

The process of claim 25, wherein said hydroxyl group containing compound has a molecular weight of from 1,800 to 12,000 and has at least two hydroxyl groups.

Claim 39

The process of claim 35, wherein said hydroxyl group containing compound is a polyhydroxyl polyether and has a molecular weight of from 3000 to 7000 and contains 3 hydroxyl groups.

Claim 40

The process of claim 25, wherein said catalyst is selected such that said reaction mixture has a flow time of less than 15 seconds.

Claim 41

The process of claim 37, wherein said catalyst is selected such that said reaction mixture has a flow time of less than 10 seconds.

Claim 42

The process of claim 38, wherein said catalyst is selected such that said reaction mixture has a flow time of less than 5 seconds.

Claim 43

An active hydrogen containing blend for use in the production of polyurethane moldings comprising: (A) an organic hydroxyl group containing compound, and (B) from 5 to 50 percent by weight based on the weight of (A) of a chain extender which is miscible with polyhydroxyl compounds in any proportion and is selected from the group consisting of aromatic diamines which contain at least one alkyl substituent in the ortho-position to a first amino group and two alkyl substituents in the ortho-position to a second amino group or mixtures thereof, with the proviso that at least two of said alkyl substituents contain at least two carbon atoms.

Claim 44

An active hydrogen containing blend for use in the production of polyurethane moldings comprising: (A) an organic hydroxyl group containing compound, and (B) from 5 to 50 percent by weight based on the weight of (A) of a chain extender which is miscible with polyhydroxyl compounds in any proportion and is selected from the group consisting of aromatic diamines which contain at least one alkyl substituent in the ortho-position to a first amino group and two alkyl substituents in the ortho-position to a second amino group or mixtures thereof, with the proviso that at least two of said alkyl substituents contain at least two carbon atoms.

Claim 45

The composition of claim 40, wherein said blend also contains a catalyst for reaction between hydroxyl groups and isocyanate groups.

Claim 46

The composition of claim 40, wherein said chain extender comprises from 5 to 35 percent by weight based on the total weight of said hydroxyl group containing compound.

Claim 47

The composition of claim 40, wherein said polyhydroxyl compound is selected from the group consisting of polyethers, polyesters, polythioethers, polyacetals, polycarbonates, polyester amides and mixtures thereof.

Claim 48

The composition of claim 40, wherein said polyhydroxyl group containing compound has a molecular weight of from 1,800 to 12,000.

Claim 49

The composition of claim 44, wherein said hydroxyl group containing compound is a polyhydroxyl polyether having at least two hydroxyl groups.

Claim 50

The composition of claim 45, wherein said polyether has a molecular weight of from 3,000 to 7,000 and contains 3 hydroxyl groups.