Water-resistant latex sealants

• US 4,340,524 A
• Filed: 06/30/1980
• Issued: 07/20/1982
• Est. Priority Date: 06/30/1980
• Status: Expired due to Term

• Current Assignee: Union Carbide Corporation (Dow, Inc.)
• Original Assignee: Union Carbide Corporation (Dow, Inc.)
• Inventors: Bullman, Allan R.
• Primary Examiner(s): Kight, III, John
• Assistant Examiner(s): YARBROUGH, AMELIA
• Application Number:
  US06/163,955
• Time in Patent Office: 750 Days
• Field of Search: 260/29.6 RB, 260/29.6 NR, 260/29.6 N, 260/29.6 MN
• US Class Current: 524/297
• CPC Class Codes: C08K 5/544 containing nitrogen
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 2666/28 Non-macromolecular organic substances
• CPC Class Codes: C08L 33/06 of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
• CPC Class Codes: C08L 57/00 Compositions of unspecified polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C08L 83/04 Polysiloxanes
• CPC Class Codes: C09J 133/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C09K 2200/0617 Polyalkenes
• CPC Class Codes: C09K 2200/0622 Polyvinylalcohols, polyvinylacetates
• CPC Class Codes: C09K 2200/0625 Polyacrylic esters or derivatives thereof
• CPC Class Codes: C09K 2200/0635 Halogen-containing polymers, e.g. PVC
• CPC Class Codes: C09K 2200/0642 Copolymers containing at least three different monomers
• CPC Class Codes: C09K 3/10 Materials in mouldable or extrudable form for sealing or packing joints or covers filling pastes C09D5/34
• CPC Class Codes: Y10T 428/31634 Next to cellulosic
• CPC Class Codes: Y10T 428/31645 Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31649 Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31692 Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31699 Ester, halide or nitrile of addition polymer

Abstract

Acrylic latex sealants are rendered water-resistant and have improved wet adhesion to a variety of substrates by incorporating hydrophobic resins and an aminosilane hydrolyzate therein.

Claims

1. In an acrylic resin latex based sealant composition, the improvement which comprises introducing about 0.1 to about 10 weight % of an hydrophobic resin dissolved in about 2 to about 20 weight % of a liquid organic, non-coagulating, non-gelling solvent into said acrylic resin latex together with an aqueous solution of about 0.5 to about 5.0 weight % of an hydrolyzed organoaminosilane containing sufficient base to maintain a pH of at least 8.5, with the proviso that the total weight of the components including the acrylic latex equals 100%.

2. Composition claimed in claim 1 wherein the organoaminosilane is represented by the graphic formula:

##STR3## wherein R°

is selected from the group consisting of alkyl having about 1-4 carbons, aryl having about 6-10 carbons and alkaryl groups having about 7-10 carbons,

y=0 or 1;

v is an integer having values of 1 to 6;

z is an integer having values of from 0 to 2 inclusive; and

X=alkoxy radicals having 1-6 carbons.

3. Composition claimed in claim 1 wherein the hydrophobic resin is a vinyl resin.

4. Composition claimed in claim 3 wherein the vinyl resin is a vinyl chloride-vinyl acetate copolymer.

5. Composition claimed in claim 3 wherein the vinyl resin is a vinyl chloride-vinyl acetate-vinyl alcohol terpolymer.

6. Composition claimed in claim 3 wherein the vinyl resin is a vinyl chloride-vinyl acetate-maleic acid terpolymer.

7. Composition claimed in claim 1 wherein the hydrophobic resin is a water-insoluble alkyl acrylate and/or methacrylate copolymer.

8. Composition claimed in claim 3 wherein the vinyl resin is polystyrene.

9. Composition claimed in claim 1 wherein the hydrophobic resin is a phenoxy resin derived from 2,2-bis(p-hydroxyphenyl)propane and epichlorohydrin.

10. Composition claimed in claim 1 wherein the organoaminosilane is gamma-aminopropyltrimethoxysilane.

11. Composition claimed in claim 1 wherein the organoaminosilane is gamma-aminopropylmethyldiethoxysilane.

12. Composition claimed in claim 1 wherein the organoaminosilane is delta-aminobutylmethyldiethoxysilane.

13. Composition claimed in claim 1 wherein the organic solvent is dibutyl phthalate.

14. Composition claimed in claim 1 wherein the acrylic resin latex is a copolymer of ethyl acrylate containing minor amounts of acrylic acid, acrylonitrile and n-methylolacrylamide.