Formaldehyde-free binder composition
An aqueous binder composition. The aqueous binder composition is obtainable by radically initiated polymerization of vinyl acetate and ethylene, in the presence of polyvinyl alcohol in an aqueous medium, wherein (a) 50 to 94 wt % of vinyl acetate, (b) 5 to 40 wt % of ethylene, (c) 0.2 to 5 wt % of acrylamide and/or methacrylamide, and (d) 0.2 to 5 wt % of maleic anhydride and/or maleic acid are copolymerized in the presence of a polyvinyl alcohol having a degree of hydrolysis of 80 to 99 mol %. The amounts in wt % are each based on the total weight of the comonomers and add up in each case to 100 wt %.
1 . An aqueous binder composition for fiber binding, comprising:
wherein the aqueous binder composition is obtainable by radically initiated polymerization of comonomers in the presence of polyvinyl alcohol in an aqueous medium;
wherein the comonomers used within the aqueous binder composition are consisting of
a) 50 to 94 wt % of vinyl acetate,
b) 5 to 40 wt % of ethylene,
c) 0.2 to 5 wt % of acrylamide and/or methacrylamide, and
d) 0.2 to 5 wt % of maleic anhydride and/or maleic acid;
wherein the comonomers are copolymerized in the presence of a polyvinyl alcohol having a degree of hydrolysis of 80 to 99 mol %; and
wherein the amounts in wt % are each based on the total weight of the comonomers and add up in each case to 100 wt %.
2 . The composition of claim 1 , wherein the aqueous binder composition further comprises one or more emulsifiers.
3 . The composition of claim 1 , wherein the comonomer a) 70 to 85 wt % of vinyl acetate is copolymerized, based on the total weight of the comonomers; or
wherein the comonomer b) 15 to 28 wt % of ethylene is copolymerized, based on the total weight of the comonomers; or
wherein the comonomer c) 0.5 to 2 wt % of acrylamide is copolymerized, based on the total weight of the comonomers; or
wherein the comonomer d) 0.2 to 2 wt % of maleic anhydride is copolymerized, based on the total weight of the comonomers.
4 . The composition of claim 1 , wherein the aqueous binder is used for producing textile sheet products.
5 . The composition of claim 4 , wherein fibers are contacted with the aqueous binder composition and subsequently dried.
6 . The composition of claim 1 , wherein the aqueous binder composition does not contain an acidic catalyst selected from the group consisting of ammonium chloride, citric acid or sulfuric acid.
7 . The composition of claim 1 , wherein there are no acid catalysts included within the aqueous binder composition.
8 . The composition of claim 1 , wherein the aqueous binder composition does not contain any acidic catalysts, which are Brönstedt acids, in an amount to result in a pH of 0 to 4.
9 . A textile sheet product, comprising:
an aqueous binder composition that is obtainable by radically initiated polymerization of comonomers in the presence of polyvinyl alcohol in an aqueous medium;
wherein the comonomers used within the aqueous binder composition are consisting of
a) 50 to 94 wt % of vinyl acetate,
b) 5 to 40 wt % of ethylene,
c) 0.2 to 5 wt % of acrylamide and/or methacrylamide, and
d) 0.2 to 5 wt % of maleic anhydride and/or maleic acid;
wherein the comonomers are copolymerized in the presence of a polyvinyl alcohol having a degree of hydrolysis of 80 to 99 mol %; and
wherein the amounts in wt % are each based on the total weight of the comonomers and add up in each case to 100 wt %.
10 . The textile sheet product of claim 9 , wherein the aqueous binder composition further comprises one or more emulsifiers.
11 . The textile sheet product of claim 10 , wherein the one or more emulsifiers are fatty alcohol ethoxylates with a degree of ethoxylation from 2 to 5, sodium salt, diisotridecylsulfosuccinate or salts thereof.
12 . The textile sheet product of claim 10 , wherein the one or more emulsifiers are present at an amount less than or equal to 0.6 wt % based on the dry weight of the polymer.
13 . The textile sheet product of claim 9 , wherein there are no acid catalysts included within the aqueous binder composition.
14 . The textile sheet product of claim 9 , wherein fibers are contacted with the aqueous binder composition and subsequently dried.
15 . The textile sheet product of claim 13 , wherein the fibers are nonwoven, polyamide, flax, hemp, coir and/or ramie.
16 . The textile sheet product of claim 9 , wherein the comonomer a) 70 to 85 wt % of vinyl acetate is copolymerized, based on the total weight of the comonomers; or
wherein the comonomer b) 15 to 28 wt % of ethylene is copolymerized, based on the total weight of the comonomers; or
wherein the comonomer c) 0.5 to 2 wt % of acrylamide is copolymerized, based on the total weight of the comonomers; or
wherein the comonomer d) 0.2 to 2 wt % of maleic anhydride is copolymerized, based on the total weight of the comonomers.
17 . The composition of claim 2 , wherein the one or more emulsifiers are fatty alcohol ethoxylates with a degree of ethoxylation from 2 to 5, sodium salt, diisotridecylsulfosuccinate or salts thereof.
18 . The composition of claim 2 , wherein the one or more emulsifiers are present at an amount less than or equal to 0.6 wt % based on the dry weight of the polymer.
19 . The composition of claim 5 , wherein the fibers are nonwoven, polyamide, flax, hemp, coir and/or ramie.