Leather-like sheet materials and method of producing same

Details Leather-like sheet materials and method of producing same Leather-like sheet materials and method of producing same

1991-02-11

1992-10-20

Lesmes, George F.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

4283155, 4283159, 4284233, 428904, 427245, B32B 326, B32B 2740

Patent

active

051569000

ABSTRACT:
A leather-like sheet material resembling natural leather is provided which has a microporous surface and comprises a fibrous substrate layer (1) and a porous, skinless surface layer (2) having an apparent density of 0.25-0.48 g/cm.sup.3 with pores having an average diameter of 15-300 .mu.m being predominantly present therein. The surface layer (2) comprises polyurethane I in which the organic diisocyanate constituent is an aromatic ring-containing organic diisocyanate and the porous structure of at least the surface portion of the surface layer (2) is provided with polyurethane II prepared from an organic diisocyanate, which mainly comprises an aliphatic diisocyanate and/or an alicyclic diisocyanate, a polymer diol and a chain extender. The surface portion of the surface layer of the leather-like sheet material may be provided with a polyurethane coat layer which mainly comprises a fine particle polyurethane, or a coat layer made of a composition composed of a polyurethane, which mainly comprises a fine particle polyurethane and a polyoxyethylene- or glycerol-modified hardened oil.

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patent: 4018954 (1977-04-01), Fukushima et al.
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patent: 4071390 (1978-01-01), Strassel
patent: 4190694 (1980-02-01), Muck et al.
patent: 4515852 (1985-05-01), Katabe et al.
patent: 4714652 (1987-12-01), Poletto

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