Laminating acrylic thermoplastic polymer compositions

Patent metadata

Field	Value
Publication number	US-10647096-B2
Application number	US-201615569571-A
Country	US
Kind code	B2
Filing date	Apr 21, 2016
Priority date	Apr 28, 2015
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

The invention provides a laminating acrylic thermoplastic polymer composition which is favorably laminated together with a layer including a plasticizer-containing polymer composition while ensuring that the migration of the plasticizer into the acrylic thermoplastic polymer composition layer is small and the resultant laminate attains excellent durability, and also provides a laminate obtained by laminating a layer including the laminating acrylic thermoplastic polymer composition onto one or both sides of a layer including the plasticizer-containing polymer composition. Further, the invention provides a polymer composition which, when the plasticizer-containing polymer described above is a vinyl chloride-based polymer, can keep sufficient adhesive force after being adhered to a layer including such a vinyl chloride-based polymer, and also provides an adhesive product using the composition. The laminating acrylic thermoplastic polymer composition is a composition for lamination with a layer including a plasticizer-containing polymer composition. The acrylic thermoplastic polymer composition includes an acrylic block copolymer (I) including at least one polymer block (A) containing methacrylic acid ester units and at least one polymer block (B) containing acrylic acid ester units; and the acrylic acid ester units constituting the polymer block (B) in the acrylic block copolymer (I) include an acrylic acid ester (1) unit represented by the general formula CH2═CH—COOR1 (1) (wherein R1 is an organic group having 1 to 3 carbon atoms).

First claim

The invention claimed is:

1. A laminate obtained by laminating a layer comprising a laminating acrylic thermoplastic polymer composition onto one or both sides of a layer comprising a second polymer composition comprising a plasticizer, wherein the laminating acrylic thermoplastic polymer composition comprises an acrylic block copolymer (I) comprising a polymer block (A) consisting of methacrylic acid ester units and a polymer block (B) comprising acrylic acid ester units; wherein
the acrylic acid ester units constituting the polymer block (B) in the acrylic block copolymer (I) comprise methyl acrylate and n-butyl acrylate in a mass ratio in a range of from 100/0 to 20/80.

2. The laminate according to claim 1 , wherein the laminating is performed by thermally melting the layer comprising the acrylic thermoplastic polymer composition.

3. An adhesive product comprising the laminate of claim 1 .

4. The laminate according to claim 1 , wherein a content of the polymer block (A) in the acrylic block copolymer (I) is not less than 5 mass %.

5. The laminate according to claim 1 , wherein a weight-average molecular weight (Mw) of the acrylic block copolymer (I) is 30,000 to 300,000; and
a content of the polymer block (B) in the acrylic block copolymer (I) is 5 to 95 mass %.

6. The laminate according to claim 1 , wherein the plasticizer is at least one selected from e group consisting of a phthalic acid ester-based plasticizer, a trimellitic acid ester-based plasticizer, a citric acid ester-based plasticizer, an aliphatic dibasic acid ester-based plasticizer, a polyester-based plasticizer, a phosphoric acid ester-based plasticizer and an epoxy-based plasticizer.

7. The laminate according to claim 1 , wherein a solubility parameter of the plasticizer is 14 to 19 (J/cm 3 ) 1/2 .

8. The laminate according to claim 1 , wherein a solubility parameter SP(P) of the plasticizer and a solubility parameter SP(B) of the polymer block (B) in the acrylic block copolymer (I) satisfy:
SP( B )−SP( P )>0.35.

9. The laminate according to claim 1 , wherein a weight change of the acrylic block copolymer (I) after soaking in di-2-ethylhexyl terephthalate at 65° C. for 12 hours is not more than 130%.

10. The laminate according to claim 1 , wherein a solubility parameter SP(B) of the polymer block (B) in the acrylic block copolymer (I) is not less than 18.1 (J/cm 3 ) 1/2 .

11. The laminate according to claim 1 , wherein the second polymer composition comprises a vinyl chloride-based polymer.

12. The laminate according to claim 1 , wherein a content of the acrylic block copolymer (I) in the laminating acrylic thermoplastic polymer composition is not less than 40 mass %.

13. The laminate according to claim 1 , wherein the mass ratio of the methyl acrylate and n-butyl acrylate is in a range of from 75/25 to 20/80.

14. The laminate according to claim 1 , wherein a solubility parameter SP(B) of the polymer block (B) in the acrylic block copolymer (I) is not less than 18.5 (J/cm 3 ) 1/2 .

15. The laminate according to claim 1 , wherein a solubility parameter SP(B) of the polymer block (B) in the acrylic block copolymer (I) is in a range of from 18.72 to 19.80 (J/cm 3 ) 1/2 .

16. The laminate according to claim 1 , wherein a solubility parameter SP(B) of the polymer block (B) in the acrylic block copolymer (I) is in a range of from 18.72 to 19.45 (J/cm 3 ) 1/2 .

Assignees

• Kuraray Co

Inventors

• Nakada Kanayo
• Morishita Yoshihiro
• Oshima Hiroshi

Classifications

• B32B2405/00

  Adhesive articles, e.g. adhesive tapes · CPC title

• C08L27/06

  Homopolymers or copolymers of vinyl chloride · CPC title

• B32B27/304

  comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF · CPC title

• B32B15/08

  of synthetic resin · CPC title

• C08L53/00

  Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers · CPC title