Crystalline high modulus thermoplastic polyurethane

Patent metadata

Field	Value
Publication number	US-10774172-B2
Application number	US-201615772545-A
Country	US
Kind code	B2
Filing date	Nov 1, 2016
Priority date	Nov 6, 2015
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

A crystalline non-reinforced thermoplastic polyurethane composition having a high flexural modulus comprises 5% to 25% of a hydroxyl-functional polyol intermediate having a weight average molecular weight of 250 to 3000 and 75% to 95% hard segment comprising an unbranched, unsubstituted, linear chain diol and an aromatic isocyanate.

First claim

What is claimed is:

1. An article comprising:
a crystalline thermoplastic polyurethane composition, comprising a reaction product of:
(a) about 5% by weight to about 25% by weight of a polyol component, wherein the polyol has a weight average molecular weight of about 250 to about 3000;
(b) about 75% to about 95% by weight of a hard segment component, wherein the hard segment component comprises (i) an aromatic polyisocyanate and (ii) a chain extender comprising an unbranched, unsubstituted, linear chain diol, wherein the crystalline thermoplastic polyurethane composition further comprises short glass fibers and wherein the crystalline thermoplastic polyurethane composition has a flexural modulus of 1,000,000 psi or greater as measured by ASTM D790.

2. The article of claim 1 wherein the polyol component comprises a hydroxyl terminated polyester having a weight average molecular weight of 400 to 1000.

3. The article of claim 2 wherein the crystalline thermoplastic polyurethane composition comprises 20% by weight of the hydroxyl terminated polyester and the hydroxyl terminated polyester is butane diol-adipate.

4. The article of claim 1 wherein the polyol component comprises a hydroxyl terminated polyether having a weight average molecular weight of 250 to 2000.

5. The article of claim 4 wherein the crystalline thermoplastic polyurethane composition comprises 5% to 10% by weight of the hydroxyl terminated polyether and the hydroxyl terminated polyether is poly(tetramethylene glycol) ether.

6. The article of claim 1 wherein the chain extender comprises 1,4 butanediol.

7. The article of claim 1 , wherein the crystalline thermoplastic polyurethane composition further comprises a flame-retardant additive and wherein the composition has at least a V1 flame rating with non-dripping properties as measured by UL 94 vertical burn testing.

8. The article of claim 7 , wherein the flame-retardant additive comprises an aluminum salt of phosphinic acid represented by the formula: [R1R2P(O)O]-3Al3+, an aluminum salt of diphosphinic acid represented by the formula: [O(O)PR1-R3-PR2(O)O]2−3Al3+2, a polymer of one or more of the foregoing, or any combination thereof, wherein R1 and R2 are hydrogen and R3 is an alkylene group.

9. The article of claim 1 , wherein the article is made by molding, extruding, or thermoforming.

10. The article of claim 1 , wherein the article is a wire jacket, a cable jacket, an eyeglass frame, an automotive component, or a medical device.

Assignees

• Lubrizol Advanced Mat Inc

Inventors

• Lu Qiwei
• Farkas Julius
• Makadia Chetan M
• Jing Alexander Jiaokai

Classifications

• C08K7/14

  Glass · CPC title

• C08K5/5313

  Phosphinic compounds, e.g. R2=P(:O)OR' · CPC title

• C08G18/6607 Primary

  with compounds of group C08G18/3203 · CPC title

• C08G18/4854

  Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group · CPC title

• C08G18/4238

  derived from dicarboxylic acids and dialcohols · CPC title