Polyacetal and polyvinylbutyral compositions and blends having enhanced surface properties and articles made therefrom
OwnerWin-Chung Lee, Francis Eichstadt +2inventors
InventorsWin-Chung Lee, Francis Eichstadt, Jerome Moraczewski, Shawn Zhang
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Abstract
Toughened polyacetal compositions and blends with low gloss having enhanced surface adhesive properties comprising polyvinylbutyrals are disclosed. Also disclosed are articles of manufacture comprising the polyacetal compositions described herein.
Claims31
A thermoplastic polyacetal composition comprising:
- (a) from about 1 to about 30 weight percent of a free-flowing gloss-reducing composition comprising from about 20 weight percent to about 95 weight percent polyvinyl butyral (PVB);
- (b) complimentally, 99 to 24 weight percent polyacetal that is melt processible in a range below about 250° C. and having a number average molecular weight (Mn) of at least 10,000;
- (c) optionally a coupling agent in an amount of up to 1.0 weight percent;
- and (d) optionally, a filler in an amount of up to about 45 weight percent.
An article comprising:
- (a) from about 1 to about 30 weight percent of a free-flowing polyvinyl butyral composition comprising from about 20 weight percent to about 95 weight percent polyvinyl butyral (PVB);
- (b) from about 99 to about 24 weight percent of a polyacetal that is melt processible in a range below about 200° C. and having a number average molecular weight (Mn) of at least 10,000;
- (c) optionally a coupling agent in an amount of up to 1.0 weight percent;
- (d) optionally, a filler in an amount of up to about 45 weight percent, and (e) optionally a core shell resin toughener, wherein the article has a Notched Izod (Nizod) toughness of at least about 1.0 ft-lbs/in2 (4.78 kJ/m2), as determined according to ASTM D256 or ISO 180.
A process for preparing a polyacetal composition having a Notched Izod of greater than about 1.0 ft-lbs/in2 (4.78 kJ/m2) as determined according to ASTM D256 and a surface gloss of less than about 68% as measured according to either ASTM D523 or ASTM D2457, the process comprising the step of:
- blending a polyacetal composition with a free-flowing polyvinyl butyral (PVB) composition and a toughener, wherein the PVB composition is included in an amount of from about 1 to about 30 wt % of the total polyacetal composition and wherein the toughener is a core shell resin.
Dependencies are inferred from the claim text.