Resin composition comprising a saponified product of vinyl acetate polymer

• US 6,288,165 B1
• Filed: 12/05/1997
• Issued: 09/11/2001
• Est. Priority Date: 06/26/1995
• Status: Expired due to Term

• Current Assignee: Kuraray Company Limited
• Original Assignee: Kuraray Company Limited
• Inventors: Nakagawa, Naoshi, Tsugaru, Toshinori, Aoyama, Akimasa, Moritani, Takeshi, Ohara, Yukihiro, Ikeda, Kaoru, Kawahara, Takaharu
• Primary Examiner(s): REDDICK, MARIE L
• Application Number:
  US08/985,873
• Time in Patent Office: 1,376 Days
• Field of Search: 524/533, 524/534, 525/59, 525/60
• US Class Current: 525/59
• CPC Class Codes: C08F 210/02 Ethene
• CPC Class Codes: C08F 218/08 Vinyl acetate
• CPC Class Codes: C08F 236/08 Isoprene
• CPC Class Codes: C08F 236/22 the radical having three or more carbon-to-carbon double bonds
• CPC Class Codes: C08F 2800/10 as molar percentages
• CPC Class Codes: C08F 2800/20 as weight or mass percentages
• CPC Class Codes: C08F 2810/20 leading to a crosslinking, either explicitly or inherently
• CPC Class Codes: C08F 6/003 from polymer solutions, suspensions, dispersions or emulsions without recovery of the polymer therefrom
• CPC Class Codes: C08F 8/12 Hydrolysis
• CPC Class Codes: C08J 5/18 Manufacture of films or sheets
• CPC Class Codes: C08L 23/0853 Vinylacetate
• CPC Class Codes: C08L 31/04 Homopolymers or copolymers of vinyl acetate

Abstract

A process for producing vinyl acetate polymers comprises, after polymerization of at least one monomer comprising vinyl acetate, adding a conjugated polyene having a boiling point of at least 20° C. Saponified products of the vinyl acetate polymers obtained by this process can give molded articles causing little coloring and generation of gel-like agglomerates.

Claims

1. A resin composition comprising:

(a) a saponified product of an ethylene-vinyl acetate copolymer and

(b) 0.000001 to 1 weight %, based on the resin composition, of a conjugated polylene having a boiling point of at least 20°

C.,

wherein said copolymer has an ethylene content of 5 to 60 mol % based on the copolymer.

2. The resin composition according to claim 1, wherein said conjugated polyene has a boiling point higher than that of vinyl acetate.

3. The resin composition according to claim 1, wherein said conjugated polyene has a functional group containing an oxygen atom.

4. The resin composition according to claim 1, wherein said conjugated polyene has a carboxyl group, a salt thereof, a hydroxyl group or an ester group.

5. The resin composition according to claim 1, wherein said conjugated polyene is polyenecarboxylic acid or a salt or an ester thereof.

6. The resin composition according to claim 1, wherein said conjugated polyene is sorbic acid.

7. The resin composition according to claim 1, wherein said copolymer has an ethylene content of 10 to 50 mol %.

8. The resin composition according to claim 1, wherein said copolymer has a degree of saponification of at least 95% of the vinyl acetate component.

9. The resin composition according to claim 1, wherein said resin composition comprises 0.0001 to 0.2% by weight of the conjugated polyene.

10. The resin composition according to claim 1, wherein said copolymer has an ethylene content of 10 to 50 mol % and a degree of saponification of at least 95% of the vinyl acetate component and said resin composition comprising 0.0001 to 0.2% by weight of sorbic acid.

11. A resin composition comprising a saponified product of a vinyl acetate polymer and 0.000001 to 1% by weight of a conjugated polyene having a functional group containing an oxygen atom.

12. The resin composition according to claim 11, wherein said vinyl acetate polymer is an ethylene-vinyl acetate copolymer.

13. The resin composition according to claim 11, wherein said conjugated polyene is polyenecarboxylic acid or a salt or an ester thereof.

14. The resin composition according to claim 11, wherein said conjugated polyene is sorbic acid.

15. The resin composition according to claim 11, wherein said copolymer has a degree of saponification of at least 95% of the vinyl acetate component.

16. The resin composition according to claim 11, wherein said resin composition comprises 0.0001 to 0.2% by weight of said conjugated polymer.