Film-forming compositions of nitrile polymer latex blends

Claim 2

A film forming composition comprising a mixture of (A) a first resin latex comprising (i) a major proportion of an olefinically unsaturated nitrile monomer, (ii) a minor amount of at least one other olefinically unsaturated monomer which is copolymerizable with the nitrile, and (B) a second resin latex comprising (i) about 20 to 60% of an olefinically unsaturated nitrile monomer, and (ii) at least one other olefinically unsaturated monomer which is copolymerizable with the nitrile, wherein the difference between the MFT of the first and second latexes is at least 10° C., and the weight ratio of the first latex to the second latex is from about 90/10 to 10/90.

Claim 3

The composition of claim 1 wherein the first and second latexes contain from 0 to 40 parts by weight on a solids basis, based on 100 parts on a solids basis of the combination of (i) and (ii) in each latex, of a preformed homopolymer of a conjugated diene or a copolymer comprising a major proportion of a conjugated diene and a minor proportion of an olefinically unsaturated comonomer.

Claim 4

The composition of claim 1 wherein the difference between the MFT of the first and second resin latexes is at least 15° C.

Claim 5

The composition of claim 1 wherein the polymerized monomer mixture in the first resin latex contains at least 55% by weight of the unsaturated nitrile.

Claim 6

The composition of claim 1 wherein the polymerized monomer mixture in the first resin latex contains from about 60 to about 95 percent by weight of an olefinically unsaturated nitrile monomer.

Claim 7

The composition of claim 1 wherein the olefinically unsaturated nitrile in the first and second latex has the formula CH.sub.2 ═C(R)--CN wherein R is hydrogen, a lower alkyl group containing up to 4 carbon atoms or a halogen.

Claim 8

The composition of claim 6 wherein the nitrile in the first and second latexes is acrylonitrile.

Claim 9

The composition of claim 1 wherein the other olefinically unsaturated monomers in the first and second latexes are each independently selected from the group consisting of acrylate esters, alpha olefins, vinyl ethers, vinyl esters, and vinyl aromatic compounds.

Claim 10

The composition of claim 8 wherein the monomer is an acrylic ester having the formula CH.sub.2 ═C(R.sub.1)--COOR.sub.2 wherein R 1 is hydrogen, an alkyl group having from about 1 to 8 carbon atoms or a halogen, and R 2 is an alkyl group having from 1 to 30 carbon atoms.

Claim 11

The composition of claim 9 wherein the acrylate ester is methyl or ethyl or a mixture thereof.

Claim 12

The composition of claim 8 wherein the alpha olefin has the structure CH.sub.2 ═CR.sub.3 R.sub.4 wherein R 3 is hydrogen or an alkyl group having from one to 7 carbon atoms, and R 4 is an alkyl group of one to 7 carbon atoms.

Claim 13

A film forming composition comprising a mixture of (A) a first resin latex comprising a major proportion of a nitrile monomer having the formula CH.sub.2 ═C(R)--CN wherein R is hydrogen, a lower alkyl group having from 1 to 4 carbon atoms or a halogen, and (ii) a minor amount of at least one acrylate ester having a formula CH.sub.2 ═C(R.sub.1)--COOR.sub.2 wherein R 1 is hydrogen, an alkyl group having from 1 to 8 carbon atoms or a halogen, and R 2 is an alkyl group having from 1 to about 30 carbon atoms and preferably 1 to about 4 carbon atoms, and (B) a second resin latex comprising (i) about 20 to 60% of a nitrile monomer having the formula CH.sub.2 ═C(R)--CN wherein R is as defined above, and (ii) an acrylate ester having the formula CH.sub.2 ═C(R.sub.1)--COOR.sub.2 wherein R 1 and R 2 are as defined above, wherein the difference between the MFT of the first and second latexes is at least 10° C., and the weight ratio of the first latex to the second latex is from about 90/10 to 10/90.

Claim 14

A film forming composition comprising a mixture of (A) a first resin latex comprising a major proportion of a nitrile monomer having the formula CH.sub.2 ═C(R)--CN wherein R is hydrogen, a lower alkyl group having from 1 to 4 carbon atoms or a halogen, and (ii) a minor amount of at least one acrylate ester having a formula CH.sub.2 ═C(R.sub.1)--COOR.sub.2 wherein R 1 is hydrogen, an alkyl group having from 1 to 8 carbon atoms or a halogen, and R 2 is an alkyl group having from 1 to about 30 carbon atoms and preferably 1 to about 4 carbon atoms, and (B) a second resin latex comprising (i) about 20 to 60% of a nitrile monomer having the formula CH.sub.2 ═C(R)--CN wherein R is as defined above, and (ii) an acrylate ester having the formula CH.sub.2 ═C(R.sub.1)--COOR.sub.2 wherein R 1 and R 2 are as defined above, wherein the difference between the MFT of the first and second latexes is at least 10° C., and the weight ratio of the first latex to the second latex is from about 90/10 to 10/90.

Claim 15

The composition of claim 12 wherein the first and second latexes can each independently contain from 0 to about 40 parts by weight on a solids basis, based on 100 parts of polymer in each latex, of a preformed homopolymer of a conjugated diene or a copolymer comprising a major proportion of a conjugated diene and a minor proportion of an olefinically unsaturated comonomer.

Claim 16

The composition of claim 12 wherein the polymerized monomer mixture in the first resin latex comprises from about 50 to 95 percent by weight of the nitrile and from 5 to 50 parts by weight of the acrylate ester.

Claim 17

The composition of claim 12 wherein the polymerized monomer mixture in the second resin latex comprises from about 20 to 60 percent by weight of the nitrile and from about 80 to 40 percent by weight of the acrylate.

Claim 18

The composition of claim 12 wherein the nitrile in the first and second latex is acrylonitrile.

Claim 19

The composition of claim 12 wherein the acrylates in the first and second latexes are each independently methyl acrylate, ethyl acrylate or a mixture thereof.

Claim 20

The composition of claim 12 wherein the polymerized monomer mixture in the first resin latex comprises from about 65 to 85 percent by weight of at least one nitrile.

Claim 21

The composition of claim 12 wherein the polymerized monomer mixture in the second latex comprises from about 35 to 60 percent by weight of at least one nitrile.

Claim 22

The composition of claim 12 wherein more than 50 percent by weight of the composition comprises the first resin latex.

Claim 23

The composition of claim 12 wherein the nitrile content in the composition is more than 50 percent by weight, based on the total resin solids.

Claim 24

The composition of claim 12 wherein the MFT of the first resin latex is at least 15° higher than the MFT of the second resin latex.

Claim 27

The method of claim 23 wherein the substrate comprises a metal surface.

Claim 28

The method of claim 23 wherein the first or second latexes, or both latexes contain up to about 40 parts by weight on a solids basis, based on 100 parts on a solids basis of the combination of the nitrile monomer and the other olefinically unsaturated monomer present in each latex, of a preformed homopolymer of a conjugated diene or a copolymer comprising a major proportion of a conjugated diene and a minor proportion of an olefinically unsaturated comonomer.

Claim 29

A film forming composition comprising a mixture of (A) a first resin latex comprising (i) a major proportion of an olefinically unsaturated nitrile monomer, (ii) a minor amount of at least one other olefinically unsaturated monomer which is copolymerizable with the nitrile, and (B) A second resin latex comprising (i) an olefinically unsaturated nitrile monomer, and (ii) at least one other olefinically unsaturated monomer which is copolymerizable with the nitrile, wherein the difference between the MFT of the first and second latexes is at least 10° C., and the weight ratio of the first latex to the second latex is from about 90/10 to 10/90, and the first or second latex or both latexes contain up to about 40 parts by weight on a solids basis, based on 100 parts on a solids basis the combination of the nitrile monomer and the other olefinic monomer in each latex, of a preformed homopolymer of a conjugated diene or a copolymer comprising a major proportion of a conjugated diene and a minor proportion of an olefinically unsaturated comonomer.

Claim 30

A film forming composition comprising a mixture of (A) a first resin latex comprising (i) a major proportion of an olefinically unsaturated nitrile monomer, (ii) a minor amount of at least one other olefinically unsaturated monomer which is copolymerizable with the nitrile, and (B) A second resin latex comprising (i) an olefinically unsaturated nitrile monomer, and (ii) at least one other olefinically unsaturated monomer which is copolymerizable with the nitrile, wherein the difference between the MFT of the first and second latexes is at least 10° C., and the weight ratio of the first latex to the second latex is from about 90/10 to 10/90, and the first or second latex or both latexes contain up to about 40 parts by weight on a solids basis, based on 100 parts on a solids basis the combination of the nitrile monomer and the other olefinic monomer in each latex, of a preformed homopolymer of a conjugated diene or a copolymer comprising a major proportion of a conjugated diene and a minor proportion of an olefinically unsaturated comonomer.

Claim 31

The composition of claim 26 wherein the polymerized monomer mixture of the first resin latex contains at least 55% by weight of the unsaturated nitrile.

Claim 32

The composition of claim 26 wherein the nitrile monomer in the first and resin latexes is acrylonitrile.

Claim 33

The composition of claim 26 wherein the other olefinically unsaturated monomers in each latex are each independently methyl acrylate, ethyl acrylate, or a mixture thereof.

Claim 34

A metal surface coated with the composition of any one of claims 1-10, 11-22 and 26-29.