Polymer blends comprising polycarbonate and polymethyl methacrylate

Patent metadata

Field	Value
Publication number	US-10155845-B2
Application number	US-201615573431-A
Country	US
Kind code	B2
Filing date	May 26, 2016
Priority date	May 28, 2015
Publication date	Dec 18, 2018
Grant date	Dec 18, 2018

Abstract

The disclosure concerns a polymer derived from melt extrusion of (i) 80 to 95 wt % polycarbonate; said polycarbonate having and endcap level of 45% to 80% and a branching level of 300-5,000 m comprising the following branching structures: (ii) 4.9 to 20 wt % polymethyl methacrylate; and (iii) 0.1 to 1.5 wt % of catalyst; wherein the polymer is transparent, and wherein transesterification occurs with at least a portion of the polycarbonate and the polymethyl methacrylate during melt extrusion.

First claim

What is claimed:

1. A polymer blend comprising a polymer derived from melt extrusion of
(i) 80 to 95 wt % polycarbonate; said polycarbonate having and endcap level of 45% to 80% and a branching level of 300-5,000 ppm comprising the following branching structures:

(ii) 4.9 to 20 wt % polymethyl methacrylate; and
(iii) 0.1 to 1.5 wt % of catalyst;
wherein said polymer is transparent,
wherein transesterification occurs with at least a portion of the polycarbonate and the polymethyl methacrylate during melt extrusion to produce a transesterification polymer; and
wherein the combined wt % value of all components does not exceed 100 wt. %, and wherein all wt % values are based on the total weight of the composition.

2. The polymer blend of claim 1 , wherein the polycarbonate having a molecular weight (Mw) of 20,000 to 120,000 Dalton on a polystyrene basis.

3. The polymer blend of claim 1 , wherein at least a portion of the polymethyl methacrylate is reacted with at least a portion of the polycarbonate and inserted into the backbone of the transesterification polymer.

4. The polymer blend of claim 1 , wherein the polycarbonate comprises at least 200 ppm of hydroxide groups.

5. The polymer blend of claim 1 , wherein the polymer comprises
(i) 85 to 90 wt % polycarbonate;
(ii) 9.8 to 15 wt % polymethyl methacrylate; and
(iii) 0.2 to 1 wt % of catalyst;
wherein the combined wt % value of all components does not exceed 100 wt. %, and wherein all wt % values are based on the total weight of the composition.

6. The polymer blend of claim 1 , wherein the catalyst comprises Zn, Sn, or Ag.

7. The polymer blend of claim 1 , wherein the catalyst is zinc acetate.

8. The polymer blend of claim 1 , wherein the polycarbonate is derived from the melt polymerization of bisphenol A with diphenyl carbonate.

9. A method of forming an article comprising:
(a) melt extrusion of
(i) 80 to 95 wt % polycarbonate; said polycarbonate having and endcap level of 45% to 80% and a branching level of 300-5,000 ppm

(ii) 4.9 to 20 wt % polymethyl methacrylate; and
(iii) 0.1 to 1.5 wt % of catalyst to produce a transparent polymer blend;

wherein said article is transparent,
wherein transesterification occurs with at least a portion of the polycarbonate and the polymethyl methacrylate during melt extrusion; and
wherein the combined wt % value of all components does not exceed 100 wt. %, and wherein all wt % values are based on the total weight of the composition and
(b) molding the polymer blend into said article.

10. The method of claim 9 , wherein the molding comprises compression or injection molding.

11. The method of claim 9 , wherein said melt extrusion utilizes a screw extruder of at least 75 rpm.

12. The method of claim 9 , wherein the extruder temperature is from 230° C. to 300° C.

13. The method of claim 9 , wherein the article comprises
(i) 80 to 95 wt % polycarbonate;
(ii) 4.9 to 20 wt % polymethyl methacrylate; and
(iii) 0.2 to 1 wt % of catalyst;
wherein the combined wt % value of all components does not exceed 100 wt. %, and wherein all wt % values are based on the total weight of the composition.

14. The method of claim 9 , wherein the polycarbonate comprises at least 200 ppm of hydroxide groups.

15. The method of claim 9 , where in the article is a graphical display or optical display.

16. A method for forming a transparent polymer blend comprising melt extrusion of
(i) 80 to 95 wt % polycarbonate; said polycarbonate having and endcap level of 45% to 75%;
(ii) 4.9 to 20 wt % polymethyl methacrylate; and
(iii) 0.1 to 1.5 wt % of catalyst;
wherein transesterification occurs with at least a portion of the polycarbonate and the polymethyl methacrylate during melt extrusion; and
wherein the combined wt % value of all components does not exceed 100 wt. %, and wherein all wt % values are based on the total weight of the composition.

17. The method of claim 16 , wherein said melt extrusion utilizes a screw extruder of at least 75 rpm.

18. The method of claim 16 , wherein the extruder temperature is from 230° C. to 300° C.

19. The method of claim 16 wherein the polycarbonate comprises at least 200 ppm of hydroxide groups.

20. The method of claim 16 , wherein the polymer additionally comprises a flame retardant, anti-drip agent, antioxidant, antistatic agent, chain extender, colorant, de-molding agent, dye, flow promoter, flow modifier, light stabilizer, lubricant, mold release agent, pigment, quenching agent, thermal stabilizer, UV absorbent substance, UV reflectant substance, UV stabilizer, or a combination comprising at least one of the foregoing.

Assignees

• Sabic Global Technologies Bv

Inventors

• Rizo Helena Varela
• Fernandez Ignacio Vic
• Del Agua Hernandez David

Classifications

• C08L69/00 Primary

  Compositions of polycarbonates; Compositions of derivatives of polycarbonates · CPC title

• C08G64/14 Primary

  containing a chain-terminating or -crosslinking agent · CPC title

• C08G81/027

  containing polyester or polycarbonate sequences · CPC title

• C08L2201/10

  Transparent films; Clear coatings; Transparent materials · CPC title

• C08L33/12

  Homopolymers or copolymers of methyl methacrylate · CPC title