Impact resistant moldable polyacetal resin compositions and proc

Details Impact resistant moldable polyacetal resin compositions and proc Impact resistant moldable polyacetal resin compositions and proc

1991-03-25

1993-02-02

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525399, 525452, 525456, C08L 6102, C08G 1856

Patent

active

051838605

ABSTRACT:
Moldable polyacetal resin compositions include a polyacetal base resin and an impact resistant effective amount of a thermoplastic polyurethane resin melt-blended therewith. The polyacetal base resin is itself a mixture of (A.sub.1) a low hydroxyl-containing (LHC) polyacetal resin having less than 50 mmol/kg hydroxyl groups in its molecule, and (A.sub.2) a high hydroxyl-containing (HHC) polyacetal resin having greater than 50 mmol/kg hydroxyl groups in its molecule. The polyacetal resin compositions optionally may include a reactive compound having at least one reactive moiety to further enhance the desirable properties that are achieved by inclusion of the HHC polyacetal resin. The components are melt-blended and subjected to conditions (which typically occur during the melt-blending step) to allow the polyurethane resin to react with the HHC polyacetal resin. As a result, a compatibilizing copolymer is formed in situ so that the polyurethane resin is compatabilized with the LHC polyacetal resin thereby minimizing delamination and increasing weld strengths of molded articles formed of the same.

REFERENCES:
patent: 4119607 (1978-10-01), Gergen et al.
patent: 4689373 (1987-08-01), Auesbach et al.
patent: 4828755 (1989-05-01), Kusumger et al.
patent: 4968756 (1990-11-01), Silvis et al.

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