Curable aqueous composition comprising a high molecular weight silane functional polymer and a relatively low molecular weight silane functional polymer
First Claim
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1. A curable composition comprising:
- A) An aqueous medium;
B) A first polymer stably dispersed in said aqueous medium, said first polymer having a weight average molecular weight of at least 50,000 and being insoluble in water, said first polymer having covalently bonded silane groups of the Formula (1);
##STR5## in which a is 0 to 2, R1 is C1-6 alkyl, and R is OH or a hydrolizable group, the groups of Formula (1) contributing from 0.05 to 2% by weight of silicon to the weight of said First polymer; and
C) A second polymer dissolved or dispersed in said aqueous medium, said second polymer having a weight average molecular weight between 300 and 20,000, comprising at least two silane groups of Formula (1), the groups of Formula (1) contributing between 0.2 and 16% by weight of silicon to the weight of said second polymer, and said second polymer also comprising covalently bonded cationic hydrophilic groups in an amount sufficient to render said second polymer soluble or self dispersible in the aqueous medium,the non-volatile weight ratio of said first polymer to said second polymer being in the range 40;
1 to 1;
4.
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Abstract
A curable composition comprising:
a) an aqueous dispersion of a Polymer having a MWt of at least 50,000, which is insoluble in water and which contains silane groups;
B) a solution or dispersion of a Polymer which has a MWt between 300 and 20,000, comprising at least two silane groups and also comprising covalently bonded cationic hydrophilic groups the ratio of the Polymer (A) to the Polymer (B) being in the range 40:1 to 1:4.
20 Citations
16 Claims
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1. A curable composition comprising:
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A) An aqueous medium; B) A first polymer stably dispersed in said aqueous medium, said first polymer having a weight average molecular weight of at least 50,000 and being insoluble in water, said first polymer having covalently bonded silane groups of the Formula (1);
##STR5## in which a is 0 to 2, R1 is C1-6 alkyl, and R is OH or a hydrolizable group, the groups of Formula (1) contributing from 0.05 to 2% by weight of silicon to the weight of said First polymer; andC) A second polymer dissolved or dispersed in said aqueous medium, said second polymer having a weight average molecular weight between 300 and 20,000, comprising at least two silane groups of Formula (1), the groups of Formula (1) contributing between 0.2 and 16% by weight of silicon to the weight of said second polymer, and said second polymer also comprising covalently bonded cationic hydrophilic groups in an amount sufficient to render said second polymer soluble or self dispersible in the aqueous medium, the non-volatile weight ratio of said first polymer to said second polymer being in the range 40;
1 to 1;
4. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An aqueous solution or dispersion of a second polymer said second polymer having a weight average molecular weight between 300 and 20,000 and comprising at least two silane groups of Formula (1):
- ##STR6## in which a is 0 to 2, R1 is C1-6 alkyl, and R is OH or a hydrolizable group, the groups of Formula (1) contributing between 0.2 and 16% by weight of silicon to the weight of said second polymer, and said second polymer also comprising covalently bonded cationic hydrophilic groups in an amount sufficient to render said second polymer soluble or self dispersible in an aqueous medium, said second polymer containing a poly(ethylene oxide).
Specification