Non-stick rubber liner

Claim 2

A non-stick rubber liner directly applied to metal equipment, comprising: a blend, said blend having thoroughly mixed therein 100 parts by weight of a rubber elastomer, said rubber elastomer selected from the group consisting of (a) natural rubber, (b) a polymer made from diene monomers having from 4 to 12 carbon atoms, (c) a copolymer made from diene monomers having from 4 to 12 carbon atoms, and (d) a copolymer made from vinyl substituted aromatic monomers having from 8 to 12 carbon atoms and diene monomers having from 4 to 12 carbon atoms; from about 10 to about 30 parts by weight of a fluorine-containing polymer, 90% of said fluorine-containing polymer having a particle size of 100 microns or less; and from about 5 to about 20 parts of an oil compound compatible with said rubber elastomer, so that said mixed blend while directly applied to the metal equipment resists gypsum build-up.

Claim 3

A non-stick rubber liner according to claim 1, wherein said fluorine-containing polymer is a powder, said fluorine-containing polymer selected from the group consisting of polytetrafluoroethylene, polychlorotrifluoroethylene, poly(vinyl fluoride), poly(vinylidene fluoride), a copolymer of polytetrafluoroethylene and hexafluoropropylene, a copolymer of vinylidene fluoride and hexafluoropropylene, a copolymer of vinylidene fluoride and chlorotrifluoroethylene, and a fluorinated ethylene-propylene copolymer, and wherein said oil is a compound which will bleed from said rubber.

Claim 4

A non-stick rubber liner according to claim 2, wherein said rubber compound is selected from the group consisting of natural rubber, polyisoprene, polybutadiene, and a polymer made from cis-1,3-polyisoprene, wherein said fluorine-containing polymer is selected from the group consisting of a copolymer of polytetrafluoroethylene and hexafluoropropylene, a fluorinated ethylene-propylene copolymer, and polytetrafluoroethylene, and wherein said oil is castor oil.

Claim 5

A non-stick rubber liner according to claim 3, wherein said rubber compound is natural rubber, wherein said fluorine-containing polymer is a fluorinated ethylene-propylene copolymer, and the amount of said copolymer is from 15 to 25 parts, wherein 90 percent of said powdered fluorinated ethylene-propylene copolymer has a particle size of 12 or smaller, and wherein said castor oil ranges from about 8 to about 15 parts.

Claim 6

A non-stick rubber liner according to claim 2, including from about 2 to about 15 parts by weight of a rubber elastomer compatible grease.

Claim 7

A non-stick rubber liner according to claim 5, wherein said rubber is selected from the group consisting of (a) natural rubber, (b) a polymer made from diene monomers having from 4 to 12 carbon atoms, (c) a copolymer made from diene monomers having from 4 to 12 carbon atoms, and (d) a copolymer made from vinyl substituted aromatic monomers having from 8 to 12 carbon atoms and diene monomers having from 4 to 12 carbon atoms; wherein said fluorine-containing polymer is selected from the group consisting of polytetrafluoroethylene, polychlorotrifluoroethylene, poly(vinyl fluoride), poly(vinylidene fluoride), a copolymer of polytetrafluoroethylene and hexafluoropropylene, a copolymer of vinylidene fluoride and hexafluoropropylene, a copolymer of vinylidene fluoride and chlorotrifluoroethylene, and a fluorinated ethylene-propylene copolymer wherein said grease is selected from the group consisting of a lithium-based grease and molybdenum disulfide, and wherein said oil bleeds from said rubber and is selected from the group consisting of mineral oil and castor oil.

Claim 8

A non-stick rubber liner according to claim 6, wherein the amount of said fluorine-containing polymer ranges from 15 parts of 25 parts, wherein the amount of said oil ranges from about 8 parts to about 15 parts, and wherein the amount of said grease ranges from about 3 parts to about 7 parts, and wherein the particle size of said fluorine-containing polymer powder is such that 90 percent of said powder has a particle size of 100 microns or less.

Claim 9

A non-stick rubber liner according to claim 7, wherein said rubber is selected from the group consisting of natural rubber, polyisoprene, polybutadiene, and a polymer made from cis-1,3-polyisoprene, wherein said fluorine compound is selected from the group consisting of a copolymer of polytetrafluoroethylene and hexafluoropropylene, a fluorinated ethylene-propylene copolymer, and polytetrafluoroethylene, and wherein 90 percent of the particle size of said fluorine-containing polymer powder is 50 microns or smaller.

Claim 10

A non-stick rubber liner according to claim 7, wherein said rubber is natural rubber, wherein said fluorine-containing polymer is a fluorinated ethylene-propylene copolymer, wherein said oil is castor oil, and wherein said grease is molybdenum disulfide.

Claim 11

A non-stick rubber liner according to claim 9, wherein the amount of said fluorinated ethylene-propylene copolymer is approximately 20 parts, wherein the amount of said castor oil is about 10 parts, and wherein the amount of said molybdenum disulfide grease is about 5 parts.

Claim 12

A non-stick rubber liner according to claim 10, wherein 90 percent of the particle sizes of said fluorine polymer is 12 microns or smaller.

Claim 13

A non-stick rubber laminate, comprising: an exterior non-stick rubber liner, an intermediate rubber layer, and an interior rubber layer; said exterior rubber liner comprising a blend having 100 parts by weight of a rubber elastomer, said rubber elastomer being selected from the group consisting of (a) natural rubber, (b) a polymer made from diene monomers having from 4 to 12 carbon atoms, (c) a copolymer made from diene monomers having from 4 to 12 carbon atoms, and (d) a copolymer made from vinyl substituted aromatic monomers having from 8 to 12 carbon atoms and diene monomers having from 4 to 12 carbon atoms; from about 10 to about 30 parts by weight of a fluorine-containing polymer, 90% of said fluorine-containing polymer having a particle size of 100 microns or less; and from about 5 to about 20 parts of an oil compound compatible with said rubber elastomer; said intermediate rubber layer having a Shore D hardness of from about 60 to about 80, said rubber selected from the group consisting of (a) natural rubber, (b) a polymer made from diene monomers having from 4 to 12 carbon atoms, (c) a copolymer made from diene monomers having from 4 to 12 carbon atoms, and (d) a copolymer made from vinyl substituted aromatic monomers having from 8 to 12 carbon atoms and diene monomers having from 4 to 12 carbon atoms; and said interior rubber layer having a Shore A hardness of from about 30 to about 40, said rubber selected from the group consisting of (a) natural rubber, (b) a polymer made from diene monomers having from 4 to 12 carbon atoms, (c) a copolymer made from diene monomers having from 4 to 12 carbon atoms, and (d) a copolymer made from vinyl substituted aromatic monomers having from 8 to 12 carbon atoms and diene monomers having from 4 to 12 carbon atoms.

Claim 14

A non-stick rubber laminate, comprising: an exterior non-stick rubber liner, an intermediate rubber layer, and an interior rubber layer; said exterior rubber liner comprising a blend having 100 parts by weight of a rubber elastomer, said rubber elastomer being selected from the group consisting of (a) natural rubber, (b) a polymer made from diene monomers having from 4 to 12 carbon atoms, (c) a copolymer made from diene monomers having from 4 to 12 carbon atoms, and (d) a copolymer made from vinyl substituted aromatic monomers having from 8 to 12 carbon atoms and diene monomers having from 4 to 12 carbon atoms; from about 10 to about 30 parts by weight of a fluorine-containing polymer, 90% of said fluorine-containing polymer having a particle size of 100 microns or less; and from about 5 to about 20 parts of an oil compound compatible with said rubber elastomer; said intermediate rubber layer having a Shore D hardness of from about 60 to about 80, said rubber selected from the group consisting of (a) natural rubber, (b) a polymer made from diene monomers having from 4 to 12 carbon atoms, (c) a copolymer made from diene monomers having from 4 to 12 carbon atoms, and (d) a copolymer made from vinyl substituted aromatic monomers having from 8 to 12 carbon atoms and diene monomers having from 4 to 12 carbon atoms; and said interior rubber layer having a Shore A hardness of from about 30 to about 40, said rubber selected from the group consisting of (a) natural rubber, (b) a polymer made from diene monomers having from 4 to 12 carbon atoms, (c) a copolymer made from diene monomers having from 4 to 12 carbon atoms, and (d) a copolymer made from vinyl substituted aromatic monomers having from 8 to 12 carbon atoms and diene monomers having from 4 to 12 carbon atoms.

Claim 15

A non-stick rubber laminate according to claim 12, wherein said fluorine-containing polymer is a powder, said fluorine-containing polymer selected from the group consisting of polytetrafluoroethylene, polychlorotrifluorethylene, poly(vinyl fluoride), poly(vinylidene fluoride), a copolymer of polytetrafluoroethylene and hexafluoropropylene, a copolymer of vinylidene fluoride and hexafluoropropylene, a copolymer of vinylidene fluoride and chlorotrifluoroethylene, and a fluorinated ethylene-propylene copolymer, and wherein said oil is a compound which will bleed from said rubber.

Claim 16

A non-stick rubber laminate according to claim 13, wherein said rubber elastomer of said exterior liner, said intermediate layer, and said interior liner is selected from the group consisting of natural rubber, polyisoprene, polybutadiene, and a polymer made from cis-1,3-polyisoprene, wherein said fluorine-containing polymer is selected from the group consisting of a copolymer of polytetrafluoroethylene and hexafluoropropylene, a fluorinated ethylene-propylene copolymer, and polytetrafluoroethylene, and wherein said oil is castor oil.

Claim 17

A non-stick rubber laminate according to claim 14, wherein said rubber liner, said intermediate layer, and said interior layer is natural rubber, wherein said fluorine-containing polymer is a fluorinated ethylene-propylene copolymer, and the amount of said copolymer is from 15 to 25 parts, wherein 90 percent of said powdered fluorinated ethylene-propylene copolymer has a particle size of 12 or smaller, and wherein said castor oil ranges from about 8 to about 15 parts.

Claim 18

A non-stick rubber laminate according to claim 13, wherein said rubber liner contains from about 2 to about 15 parts by weight of a rubber elastomer compatible grease.

Claim 19

A non-stick rubber laminate according to claim 16, wherein said rubber in said rubber liner, said intermediate layer, and said interior layer is selected from the group consisting of (a) natural rubber, (b) a polymer made from diene monomers having from 4 to 12 carbon atoms, (c) a copolymer made from diene monomers having from 4 to 12 carbon atoms, and (d) a copolymer made from vinyl substituted aromatic monomers having from 8 to 12 carbon atoms and diene monomers having from 4 to 12 carbon atoms; wherein said fluorine-containing polymer is selected from the group consisting of polytetrafluoroethylene, polychlorotrifluoroethylene, poly(vinyl fluoride), poly(vinylidene fluoride), a copolymer of polytetrafluoroethylene and hexafluoropropylene, a copolymer of vinylidene fluoride and hexafluoropropylene, a copolymer of vinylidene fluoride and chlorotrifluoroethylene, and a fluorinated ethylene-propylene copolymer, wherein said grease is selected from the group consisting of a lithium-based grease and molybdenum disulfide, and wherein said oil bleeds from said rubber and is selected from the group consisting of mineral oil and castor oil.

Claim 20

A non-stick rubber laminate according to claim 17, wherein the amount of said fluorine-containing polymer ranges from 15 parts to 25 parts, wherein the amount of said oil ranges from about 8 parts to about 15 parts, and wherein the amount of said grease ranges from about 3 parts to about 7 parts, and wherein the particle size of said fluorine-containing polymer powder is such that 90 percent of said powder has a particle size of 100 microns or less.

Claim 21

A non-stick rubber laminate according to claim 18, wherein said rubber in said rubber liner, said intermediate layer, and said interior layer is selected from the group consisting of natural rubber, polyisoprene, polybutadiene, and a polymer made from cis-1,3-polyisoprene, wherein said fluorine compound is selected from the group consisting of a copolymer of polytetrafluoroethylene and hexafluoropropylene, a fluorinated ethylene-propylene copolymer, and polytetrafluoroethylene, and wherein 90 percent of the particle size of said fluorine-containing polymer powder is 50 microns or smaller.

Claim 22

A non-stick rubber laminate according to claim 19, wherein said rubber in said rubber liner, said intermediate layer, and said interior layer is natural rubber, wherein said fluorine-containing polymer is a fluorinated ethylene-propylene copolymer, wherein said oil is castor oil, and wherein said grease is molybdenum disulfide.

Claim 23

A non-stick rubber laminate according to claim 20, wherein the amount of said fluorinated ethylene-propylene copolymer is approximately 20 parts, wherein the amount of said castor oil is about 10 parts, and wherein the amount of said molybdenum disulfide grease is about 5 parts.

Claim 24

A non-stick rubber laminate according to claim 21, wherein 90 percent of the particle size of said fluorine polymer is 12 microns or smaller.