Patent ID: 8092919

Claim:
An article comprising a toughened polyacetal composition wherein the toughened polyacetal composition comprises: (a) from about 1 to about 30 weight percent of a free-flowing polyvinyl butyral (PVB) composite composition comprising from about 20 weight percent to about 95 weight percent polyvinyl butyral (PVB); (b) 99 to 24 weight percent polyacetal that is melt processible in a range below about 250° C. and having a number average molecular weight of at least 10,000; (c) at least about 1 weight percent toughening agent, wherein the toughening agent is either an ethylene-vinyl acetate copolymer, polyurethane polymer, or a combination of the two; (d) optionally, an amino-functional silane coupling agent in an amount of up to 1.0 weight percent selected from the group consisting of: 3-aminopropyltrialkoxysilane; gamma-aminopropyltrimethoxysilane; gamma-aminopropyltriethoxysilane, N-2-aminopropyltrialkoxysilane; and N-(2-aminoethyl)-3-aminopropylmethyldialkoxysilane; (e) optionally, a filler in an amount of up to about 45 weight percent wherein the article has a toughness as measured according to ASTM D256 or ISO 180 of greater than about 1 ft-lb/in 2 (4.78 kJ/m 2 ) and surface gloss of less than about 68% when measured from an angle of 60 degrees according to either ASTM D2457 or ASTM D523, wherein the article is a laminate comprising a layer of PVB sheeting as interlayer, wherein the laminate has a Compressive Shear Stress (CSS) greater than 300 pounds per square inch (psi); and wherein the article further comprises a layer of a thermoplastic elastomeric polymer.