Semi-permeable nonwoven laminate

Details Semi-permeable nonwoven laminate Semi-permeable nonwoven laminate

1987-01-23

1988-08-23

McCamish, Marion C.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

156 622, 156 624, 156 628, 428288, 428296, 428373, 428374, B32B 2700

Patent

active

047660295

ABSTRACT:
A house wrap consists of a three-layer, semi-permeable, nonwoven laminate. The two exterior layers are spun-bond polypropylene having a melt flow of 35 grams per ten minutes at 230.degree. C. The interior layer is a two-component melt-blown layer of polyethylene and polypropylene. The polypropylene has a melt flow of 260 and the polyethylene has a melt flow of 350. The laminate is calendered after formation so that the polyethylene melts and flows to close up the interstitial space and to bond the layers together to create a strong semi-permeable laminate.

REFERENCES:
patent: 3509009 (1970-04-01), Hartmann et al.
patent: 3639195 (1972-02-01), Sanders et al.
patent: 3841953 (1974-10-01), Lohkamp et al.
patent: 3914497 (1975-10-01), Kanehira et al.
patent: 4323626 (1982-04-01), Kunimune et al.
patent: 4384098 (1983-05-01), Hagler et al.
patent: 4555811 (1985-12-01), Shimalla et al.
patent: 4632861 (1986-12-01), Vassilatos

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