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Toughened polyacetal compositions and blends having low surface gloss

A composition and technology of polyacetal, applied in chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve problems such as increasing gloss

Inactive Publication Date: 2007-08-22
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, polyurethane is used as a toughening agent in US patents: 4,640,949; 4,804,716; 4,845,161; 5,286,807, but still adds gloss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0039] Embodiment 1-4 and comparative example C1

[0040] In the following examples, free-flowing PVB / EVA pellets 1 with Delrin  500P homopolymer (NC0101) melt blended. Delrin(R) graded products are commercially available from E.I. DuPont deNemours and Company (DuPont). The components were premixed prior to compounding by melt blending in a 34 mm Leistritz twin screw extruder at a melting temperature below 230°C. The screw speed was 200 rpm and the total feed rate to the extruder was 15 lbs / hour.

[0041]The resulting bars were quenched in water, cut into pellets, and sparged with nitrogen to cool. According to ASTM D3641, the tensile test bar was obtained by injection molding method, and measured: the notched impact (Nizod) value was obtained by ASTM D256 or ISO 180; the percent elongation at yield (%EL-Y) was obtained by ASTM D638 or ISO 527; by ASTM D638 or ISO 527 to get elongation at break (EL-B); get tensile strength (TS) through ASTM D638 or ISO 527; get flexural ...

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PUM

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Abstract

Polyacetal compositions and blends toughened with polyvinylbutyral having enhanced adhesive surface properties, including enhanced surface adhesion and low surface gloss, are disclosed. Also disclosed are articles of manufacture comprising the polyacetal compositions described herein.

Description

[0001] This application claims the benefit of US Provisional Application Serial No. 60 / 582,571, filed June 24,2004. field of invention [0002] The present invention relates to blends of polyoxymethylene (polyacetal) and polyvinyl butyral (PVB). More particularly, the invention relates to such blends, processes for the preparation of such materials and molded articles prepared therefrom. Background of the invention [0003] Polyoxymethylene compositions are useful as engineering resins due to physical properties that make polyoxymethylene a preferred raw material for a number of end uses. Articles of polyoxymethylene compositions generally have highly desirable physical properties, such as high hardness, high strength, and solvent resistance. However, such articles exhibit poor adhesion to other materials due to their highly crystalline surface, painting, pasting or printing such surfaces, overcasting such articles with thermoplastic polymers, or incorporating some other ty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/00C08L59/02C08L29/14B32B27/30
CPCC08L75/04C08L59/02C08L29/14B32B27/30C08L75/06C08L59/00C08L23/0853C08L2205/03C08L2205/02C08L2666/02C08L2666/04C08L2666/14C08L2666/20C08L29/00C08L23/00C08K3/34
Inventor W·-C·李F·J·埃希施塔德特J·P·莫拉切夫斯基
Owner EI DU PONT DE NEMOURS & CO