Water-based resin composition, weather resistance improver for water-based paint using the same, weather resistance improver for thermoplastic resin, and weather resistance improver for solvent-based paint

• US 7,935,772 B2
• Filed: 05/26/2006
• Issued: 05/03/2011
• Est. Priority Date: 05/26/2005
• Status: Active Grant

• Current Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Original Assignee: Mitsubishi Rayon Company Limited (Mitsubishi Chemical Holdings Corporation)
• Inventors: Kiura, Masaaki, Tanaka, Motomi, Mukuda, Takahiro
• Primary Examiner(s): Cain; Edward J
• Application Number:
  US11/915,485
• Publication Number:
  US 20090105419A1
• Time in Patent Office: 1,803 Days
• Field of Search: 526/265, 524/801, 524/808
• US Class Current: 526/265
• CPC Class Codes: C08F 2/26 anionic
• CPC Class Codes: C08F 220/1804 C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
• CPC Class Codes: C08F 220/34 Esters containing nitrogen , e.g. N,N-dimethylaminoethyl (meth)acrylate
• CPC Class Codes: C08F 220/36 containing oxygen in addition to the carboxy oxygen , e.g. 2-N-morpholinoethyl (meth)acrylate or 2-isocyanatoethyl (meth)acrylate
• CPC Class Codes: C09D 5/024 characterised by the additives

Abstract

Disclosed is a water-based resin composition containing a copolymer (A) which is obtained by carrying out emulsion polymerization of an unsaturated monomer composed of 0.5 to 50 parts by mass of a specific ethylenically unsaturated monomer (a) having a piperidyl group in a molecule and 50 to 99.5 parts by mass of an ethylenically unsaturated monomer (b), which does not substantially contain an ethylenically unsaturated monomer having a specific functional group in a molecule, with the total of the ethylenically unsaturated monomers (a) and (b) being 100 parts by mass, under the coexistence of 0.1 to 10 parts by mass of an emulsifier. Also disclosed are a weather resistance improver for water-based paints using the foregoing water-based resin composition, a weather resistance improver for thermoplastic resins, and a weather resistance improver for solvent-based paints.

Claims

1. A water-based resin composition comprising a copolymer (A) which is obtained by carrying out emulsion polymerization of unsaturated monomers comprising:

0.5 to 50 parts by mass of at least one ethylenically unsaturated monomer (a), represented by the following general formula (I), having a piperidyl group in a molecule and 50 to 99.5 parts by mass of at least one ethylenically unsaturated monomer (b), wherein ethylenically unsaturated monomer (b) does not substantially contain an ethylenically unsaturated monomer having a functional group represented by the following formula (II), (III), or (IV) in a molecule,

with the total of the ethylenically unsaturated monomers (a) and (b) being 100 parts by mass,

in the presence of 0.1 to 10 parts by mass of an emulsifier,

2. The water-based resin composition according to claim 1, wherein the unsaturated monomers comprise 6 to 50 parts by mass of the at least one ethylenically unsaturated monomer (a) and 50 to 94 parts by mass of the at least one ethylenically unsaturated monomer (b).

3. The water-based resin composition according to claim 1, wherein the emulsifier is a reactive emulsifier comprising a radical polymerizable unsaturated double bond in its molecule.

4. The water-based resin composition according to claim 3, wherein the reactive emulsifier is a reactive anion emulsifier comprising a radical polymerizable unsaturated double bond in its molecule.

5. The water-based resin composition according to claim 1, wherein the mass average molecular mass of the copolymer (A) is 5,000 to 300,000.

6. The water-based resin composition according to claim 1, wherein the copolymer (A) is a copolymer obtained by carrying out emulsion polymerization of 100 parts of an unsaturated monomer mixture in the presence of 0.1 to 10 parts of a chain transfer agent.

7. The water-based resin composition according to claim 1, wherein minimum film forming temperature (MFT) of the water-based resin composition is 70°

C. or below.

8. The water-based resin composition according to claim 1, wherein solid content of the water-based resin composition is 30 to 70% by mass.

9. A weather resistance improver for water-based paints comprising the water-based resin composition according to any one of claims 1 to 8.

10. A water-based paint comprising 1 to 50% by mass of the weather resistance improver for water-based paints according to claim 9 and 50 to 99% by mass of another water-based resin.

11. A water-based paint comprising the water-based resin composition according to any one of claims 1 to 8.

12. A resin composition obtained by recovering solid matter in the water-based resin composition according to any one of claims 1 to 8.

13. A weather resistance improver for thermoplastic resins comprising the resin composition according to claim 12.

14. A thermoplastic resin composition comprising the weather resistance improver for thermoplastic resins according to claim 13.

15. A weather resistance improver for solvent-based paints comprising the resin composition according to claim 12.

16. A solvent-based paint comprising the weather resistance improver for solvent-based paints according to claim 15.