IP Library Granted Patent US 8,188,169
Granted Patent B2
US 8,188,169 · App. 12/547,986 · Granted May 29, 2012

Polyoxymethylene compositions and articles made from these

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Quick Facts
Patent No.
US 8,188,169
App. No.
12/547,986
Granted
May 29, 2012
Kind
B2
Abstract

Polyoxymethylene compositions that include 90 to 99.9 weight percent of at least one polyacetal polymer and 0.1 to 10 wt % of at least one polysaccharide substantially free of acidic material selected from the group consisting of amylopectin from maize and soluble starch where the weight percent of the polymer and the polysaccharide are based on their combined weight. Articles made from these compositions.

Claims (15)

1. A polyoxymethylene composition comprising

(a) 90 to 99.9 weight percent of at least one polyoxymethylene polymer, and

(b) 0.1 to 10 weight percent of at least one polysaccharide

selected from amylopectin and amylodextrin;

wherein the weight percent of each of a) and b) is based on the total amount a) and b); and

(c) optionally, 0.1 to 3.0 weight percent of a polymeric stabilizer containing formaldehyde reactive nitrogen groups;

d) a hydroxyl containing polymer selected from the group consisting of poly(vinyl alcohol), poly(ethylene vinyl alcohol), poly(hydroxyethyl methacrylate), poly(hydroxypropyl methacrylate), and hydrolyzed vinyl acetate/methacrylate copolymer;

(e) optionally, 1 to 40 weight percent of reinforcing agents,

wherein the weight percent of each of (c), (d) and (e) is based on the total composition; and

wherein the pH of an aqueous suspension of 1 to 10 weight percent of the polysaccharide (b) is 5.5 to 8.

2. The composition of claim 1 , wherein the polymeric stabilizer containing formaldehyde reactive nitrogen groups is polyacrylamide or polymethacrylamide.

3. The composition of claim 1 , wherein the reinforcing agent is selected from the group consisting of glass fiber, carbon fiber, and combinations of these.

4. The composition of claim 1 , further comprising an additive selected from the group consisting of (i) impact modifier, (ii) lubricant, (iii) antioxidant, (iv) nanoclay, (v) nucleating agent, (vi) flame retardant and (vii) mold release agent.

5. An article made from the composition of claim 1 .

6. An article made from the composition of claim 4 .

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 17, 2009
From: MORACZEWSKI, JEROME P.; POLLINO, JOEL M.
To: E. I. DU PONT DE NEMOURS AND COMPANY
Reel/Frame 023247/0063 →