C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 67/02 (2006.01) C08J 9/00 (2006.01) C08K 5/09 (2006.01) C08K 5/15 (2006.01) C09J 9/00 (2006.01)
Patent
CA 2131628
Disclosed is a process for obtaining polyester articles, including foamed articles, containing low levels of extractable branching agent. The process comprises: (1) forming a molten mixture comprising (i) a major amount of a first resin composition comprising polyester and from 0 up to about 1 wt. % of a compound capable of branching the polyester, and (ii) a minor amount of a second polyester resin composition comprising at least about 50 wt % polyester resin and greater than about 2 wt. % of a compound capable of branching the polyester, wherein the relative amounts of (i) and (ii) are such that said molten mixture comprises from about 0.1 wt. % to about 1 wt. % of said branching compound; (2) adding a blowing agent to the molten mixture; and (3) extruding the resultant mixture to obtain a foam. The invention is also directed to the second composition used in the above process, and foamed polyester articles obtained from the process.
Chiang Weilong
Kelly John Joseph
Melquist John Leslie
Rotter George Edmund
Tsai Boh Chand
Amoco Corporation
Bp Corporation North America Inc.
Gowling Lafleur Henderson Llp
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