Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1995-12-07
1999-10-05
Cooney, Jr., John M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521 61, 521 64, 521134, 521142, 4283155, 428461, 428500, C08F 1606
Patent
active
059625449
ABSTRACT:
A microporous shaped article is provided. The article comprises ethylene-vinyl alcohol copolymer which has an internal structure of a multiplicity of spaced, randomly dispersed, non-uniform shaped particles of ethylene-vinyl alcohol copolymer. Also provide is process for preparing microporous shaped articles comprising the steps of: (a) melt blending to form a mixture comprising ethylene-vinyl alcohol copolymer and a compatible polymer or compound in which the copolymer will dissolve to form a solution at the melting temperature of the copolymer, but will phase separate on cooling at or below the crystallization temperature of the ethylene-vinyl alcohol copolymer; (b) forming a shaped article of the melt blended mixture; (c) cooling the shaped article to a temperature to cause phase separation to occur between the compatible copolymer or compound and the ethylene-vinyl alcohol copolymer, thereby providing an article comprising an aggregate of a first phase comprising particles of ethylene-vinyl alcohol copolymer in a second phase comprising the compatible polymer or compound with adjacent ethylene-vinyl alcohol copolymer particles being distinct but having a plurality of zones of continuity; and (d)i) collecting said article which has adjacent ethylene-vinyl alcohol copolymer particles which form a network of interconnected micropores therebetween, or ii) extracting the compatible polymer or compound with water and stretching the shaped article in at least one direction while wet to further separate adjacent ethylene-vinyl alcohol copolymer particles from one another and to permanently attenuate the ethylene-vinyl alcohol copolymer in the zones of continuity to form fibrils therebetween and drying, or iii) extracting the compatible polymer or compound with an organic solvent, and optionally stretching.
REFERENCES:
patent: 3839516 (1974-10-01), Williams et al.
patent: 4134837 (1979-01-01), Yamashita
patent: 4220543 (1980-09-01), Yamishita
patent: 4317729 (1982-03-01), Yamashita et al.
patent: 4402940 (1983-09-01), Nose et al.
patent: 4539256 (1985-09-01), Shipman
patent: 4863792 (1989-09-01), Mrozinski
patent: 4968733 (1990-11-01), Muller et al.
patent: 5120594 (1992-06-01), Mrozinski
patent: 5443727 (1995-08-01), Gagnon
3M
Cooney Jr. John M.
Griswold Gary L.
Little Douglas B.
Tamte Roger R.
LandOfFree
Microporous materials of ethylene-vinyl alcohol copolymer and me does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Microporous materials of ethylene-vinyl alcohol copolymer and me, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microporous materials of ethylene-vinyl alcohol copolymer and me will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1172301