Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
246 words
A method for producing spherical powder of a hydrolyzed ethylene-vinyl acetate copolymer or its carboxyl modified product, which comprises mixing (A) 100 parts by weight of (1) a hydrolyzed product of an ethylene-vinyl acetate copolymer having 5 to 50% by weight of vinyl acetate group content or (2) a carboxyl modified product of said hydrolyzed product obtained by reacting said hydrolyzed product with an unsaturated carboxylic acid or cyclic acid anhydride, both of said (1) and (2) containing sodium acetate as an impurity, with (B) 10 to 100 parts by weight of an organic solvent which is capable of dissolving said hydrolyzed product or said carboxyl modified product, said solvent being not freely miscible with water and having a boiling point of not lower than 80° C., (C) 300 to 1000 parts by weight of water, (D) 0.1 to 10 parts by weight of an alkylphenol ethylene oxide adduct having an HLB value of 10 to 20, and (E) an alkylbenzene sulfonic acid, emulsifying the resultant mixture while maintaining said mixture at a temperature of not lower than the softening point of said hydrolyzed product or said carboxyl modified product, and not higher than 95° C., and decreasing the temperature of the resultant system, under stirring, down to not higher than said softening point, to produce said powder which has a virtually spherical particle form and which has a particle size distribution such that not less than 70% of the particles are between 70 and 300μ.
Claim 2
Independent Claim
246 words
A method for producing spherical powder of a hydrolyzed ethylene-vinyl acetate copolymer or its carboxyl modified product, which comprises mixing (A) 100 parts by weight of (1) a hydrolyzed product of an ethylene-vinyl acetate copolymer having 5 to 50% by weight of vinyl acetate group content or (2) a carboxyl modified product of said hydrolyzed product obtained by reacting said hydrolyzed product with an unsaturated carboxylic acid or cyclic acid anhydride, both of said (1) and (2) containing sodium acetate as an impurity, with (B) 10 to 100 parts by weight of an organic solvent which is capable of dissolving said hydrolyzed product or said carboxyl modified product, said solvent being not freely miscible with water and having a boiling point of not lower than 80° C., (C) 300 to 1000 parts by weight of water, (D) 0.1 to 10 parts by weight of an alkylphenol ethylene oxide adduct having an HLB value of 10 to 20, and (E) an alkylbenzene sulfonic acid, emulsifying the resultant mixture while maintaining said mixture at a temperature of not lower than the softening point of said hydrolyzed product or said carboxyl modified product, and not higher than 95° C., and decreasing the temperature of the resultant system, under stirring, down to not higher than said softening point, to produce said powder which has a virtually spherical particle form and which has a particle size distribution such that not less than 70% of the particles are between 70 and 300μ.
Claim 3
Dependent Claim
21 words
A method as claimed in claim 1, wherein the alkylphenol ethylene oxide adduct has an HLB value of 13 to 19.
Claim 4
Dependent Claim
21 words
A method as claimed in claim 1, wherein the organic solvent is an aromatic hydrocarbon having 6 to 14 carbon atoms.
Claim 5
Dependent Claim
15 words
A method as claimed in claim 1, wherein the unsaturated carboxylic acid is acrylic acid.
Claim 6
Dependent Claim
15 words
A method as claimed in claim 1, wherein the cyclic acid anhydride is maleic anhydride.
Claim 7
Dependent Claim
24 words
A method as claimed in claim 1, wherein the hydrolyzed product of an ethylene-vinyl acetate copolymer has a 5 to 95% degree of hydrolysis.
Claim 8
Dependent Claim
43 words
A method as claimed in claim 1, wherein the carboxyl modified product is obtained by reacting the hydrolyzed product with 0.1 to 15% by weight of the unsaturated carboxylic acid or the cyclic acid anhydride based on the weight of the hydrolized product.
Claim 9
Dependent Claim
21 words
A method as claimed in claim 1, wherein the amount of the organic solvent is 20 to 80 parts by weight.
Claim 10
Dependent Claim
23 words
A method as claimed in claim 1, wherein the amount of the alkylphenol ethylene oxide adduct is 0.2 to 2.0 parts by weight.
Claim 11
Dependent Claim
20 words
A method as claimed in claim 1, wherein the amount of the water is 400 to 800 parts by weight.