IP Library Granted Patent US 8,138,247
Granted Patent B2
US 8,138,247 · App. 12/548,672 · Granted Mar 20, 2012

Polyoxymethylene compositions and articles made from these

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Quick Facts
Patent No.
US 8,138,247
App. No.
12/548,672
Granted
Mar 20, 2012
Kind
B2
Abstract

Polyoxymethylene compositions comprising (a) 20 to 80 weight percent polyacetal homopolymer, copolymer, or mixtures of these; (b) 5 to 40 weight percent glass fiber; (c) 0.1 to 2 weight percent polymeric thermal stabilizer selected from the group consisting of polyacrylamide, polymethacrylamide, and mixtures of these; (d) 0.02 to 2 weight percent allantoin; and 0.1 to 5 weight percent of an ethylene copolymer of the formula E/X/Y; wherein Y includes a glycidyl group. Articles made from these compositions.

Claims (17)

1. A polyacetal thermoplastic composition comprising:

a) 20 to 80 weight percent polyacetal polymer,

the polymer being homopolymer, copolymer, or mixtures of these;

b) 5 to 40 weight percent glass fiber;

c) 0.1 to 2 weight percent polymeric thermal stabilizer selected from the group consisting of a polyacrylamide, a polymethacrylamide, and mixtures of these;

d) 0.02 to 2 weight percent allantoin;

e) 0.1 to 5 weight percent of an ethylene copolymer of the formula E/X/Y, wherein each of the a) to e) components is based on the weight of the composition; and

wherein:

E comprises 40 to 90 weight percent of the ethylene copolymer and is the radical formed from ethylene;

X comprises 10 to 40 weight percent of the ethylene copolymer and is a radical formed from monomers selected from the group consisting of CH 2 ═CH(R 1 )—C(O)—OR 2 ,

wherein R 1 is H, CH 3 or C 2 H 5 , R 2 is an alkyl group having 1-8 carbon atoms, vinyl acetate, or a mixture of these; and

Y comprises 0.5 to 20 weight percent of the ethylene copolymer and is a radical formed from monomers selected from the group consisting of

CH 2 ═CH(R 1 )—C(O)—OR 3

wherein R 3 is glycidyl, and R 1 is R 1 is H, CH 3 or C 2 H 5 .

2. The thermoplastic composition of claim 1 having 20 to 40 weight percent of the glass fiber; and 0.1 to 2 weight percent of the ethylene copolymer of the formula E/X/Y.

3. The composition of claim 1 wherein the polymeric thermal stabilizer is polyacrylamide.

4. A molded article comprising the composition of claim 1 .

Assignments (4)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 29, 2025
From: DUPONT POLYMERS, INC.
To: DELRIN USA, LLC
Reel/Frame 073323/0244 →
SECURITY INTEREST Recorded Nov 2, 2023
From: DELRIN USA, LLC
To: GOLDMAN SACHS BANK USA, AS COLLATERAL AGENT
Reel/Frame 065441/0937 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 26, 2019
From: E. I. DU PONT DE NEMOURS AND COMPANY
To: DUPONT POLYMERS, INC.
Reel/Frame 049590/0650 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 22, 2009
From: SHINOHARA, KENICHI; SHIBUYA, MAIKO
To: E. I. DU PONT DE NEMOURS AND COMPANY
Reel/Frame 023262/0883 →