Increased throughput in melt fabrication and foaming of polyeste

Details Increased throughput in melt fabrication and foaming of polyeste Increased throughput in melt fabrication and foaming of polyeste

1993-12-17

1994-08-23

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 79, 521 81, 521 97, 521138, 264 54, C08J 900

Patent

active

053408462

ABSTRACT:
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.

REFERENCES:
patent: 3553157 (1971-01-01), Dijkstra et al.
patent: 4145466 (1979-03-01), Leslie et al.
patent: 4933429 (1990-06-01), McCracken et al.
patent: 5000991 (1991-03-01), Hayashi et al.
patent: 5134028 (1992-07-01), Hayashi et al.

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