Polycarbonate-based thermoplastic compositions having improved transparency properties

Patent metadata

Field	Value
Publication number	US-12331190-B2
Application number	US-202318727355-A
Country	US
Kind code	B2
Filing date	Jan 9, 2023
Priority date	Jan 10, 2022
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

A thermoplastic composition includes: a transparent thermoplastic resin; from about 0.1 wt % to about 2 wt % of a mold release agent including pentaerythritol tetrastearate (PETS); and from 0.01 wt % to about 5 wt % of a stabilizer component. The PETS is derived from an aliphatic carboxylic acid having less than 50 wt % content of C18 or longer alkane chains. The thermoplastic composition has improved transparency properties as compared to comparative compositions including PETS derived from an animal source.

First claim

What is claimed is:

1. A thermoplastic composition comprising:
a thermoplastic resin comprising a polycarbonate copolymer comprising a polyester-polycarbonate copolymer, an isophthalate-terephthalate-resorcinol (ITR)-polycarbonate copolymer, or a combination thereof;
from about 0.1 wt % to about 0.3 wt % of a mold release agent comprising a pentaerythritol tetrastearate derived from an aliphatic carboxylic acid having less than 50 wt % content of C18 or longer alkane chains; and
from 0.01 wt % to about 5 wt % of a stabilizer component,
wherein the composition
(1) has a haze that is at least 15% lower than that of a comparative composition that includes pentaerythritol tetrastearate derived form an animal source instead of the mold release agent derived from an aliphatic carboxylic acid having less than 50 wt % content of C18 or longer alkane chains, or
(2) has a notched Izod impact strength (NII) that is at least 15% higher than that of a comparative composition that includes pentaerythritol tetrastearate derived from an animal source instead of the mold release agent derived from an aliphatic carboxylic acid having less than 50 wt % content of C18 or longer alkane chains, wherein NII is determined according to ASTM D256 and ASTM D4812 at 23° C. with a pendulum energy of 5 pound-force per foot (lbf/ft), and

wherein the combined weight percent value of all components does not exceed 100 wt %, and all weight percent values are based on the total weight of the composition.

2. The thermoplastic composition according to claim 1 , wherein the mold release agent is derived from a plant or vegetable source.

3. The thermoplastic composition according to claim 1 , wherein the composition comprises an ITR-polycarbonate copolymer comprising from 10-90 wt % ITR blocks and from 10-90 wt % polycarbonate blocks.

4. The thermoplastic composition according to claim 1 , wherein the stabilizer component comprises a thermal stabilizer, a hydro stabilizer, a UV stabilizer, or a combination thereof.

5. The thermoplastic composition according to claim 1 , wherein the composition further comprises at least one additional additive.

6. The thermoplastic composition according to claim 5 , wherein the at least one additional additive comprises an acid scavenger, an anti-drip agent, an antioxidant, an antistatic agent, a chain extender, a colorant, a flow promoter, a lubricant, a plasticizer, a quenching agent, a flame retardant, a UV reflecting additive, an impact modifier, a blowing agent, a reinforcing agent, or a combination thereof.

7. The thermoplastic composition according to claim 5 , wherein the composition comprises from greater than 0 wt % to about 5 wt % of at the least one additional additive.

8. The thermoplastic composition according to claim 5 , wherein the composition comprises from greater than 0 wt % to about 10 wt % of a reinforcing agent comprising glass fiber.

9. The thermoplastic composition according to claim 1 , wherein the composition has a haze of less than 3.5% as tested in accordance with ASTM D2244 with a 10° observer and a D65 illuminant.

10. An article comprising the thermoplastic composition according to claim 1 .

11. The article according to claim 10 , wherein the article comprises one or more of a lens, window, automobile headlight cover, and lamp cover.

Assignees

• Shpp Global Tech Bv

Inventors

• Wang Qin
• Yang Jian
• Wan Xingqiu

Classifications

• C08L2205/06

  having improved processability or containing aids for moulding methods · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C08L2201/10

  Transparent films; Clear coatings; Transparent materials · CPC title

• C08K5/524

  Esters of phosphorous acids, e.g. of H3PO3 · CPC title

• C08K5/103 Primary

  with polyalcohols · CPC title