Process for producing finished and/or irreversibly embossed micr

Details Process for producing finished and/or irreversibly embossed micr Process for producing finished and/or irreversibly embossed micr

1975-10-22

1977-11-22

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

260 25AY, 264 41, 264134, 264331, 264DIG77, 427246, 427276, 427278, 428151, 428320, 428904, B29D 2704, B32B 330, B32B 3112

Patent

active

040596591

ABSTRACT:
This invention relates to a process for producing finished and/or irreversibly embossed microporous sheet structures by coagulation of a polyurethane solution, in which prior to the coagulation of the polyurethane solution a finishing agent is mixed into it or a finishing agent is applied to the free surface of the polyurethane solution which has been spread out flat and embossing is then carried out during or shortly after the coagulation or after the washing, but still before the drying, or else the microporous sheet structure obtained and into which the finishing agent has been mixed previously is, after drying, pressed between two plates or passed under pressure between at least two oppositely rotating rolls, at least one of which is highly polished.

REFERENCES:
patent: 3625871 (1971-12-01), Traubel et al.
patent: 3645775 (1972-02-01), Schulze et al.
patent: 3681125 (1972-08-01), Traubel et al.
patent: 3687715 (1972-08-01), Kigane et al.
patent: 3689629 (1972-09-01), Hull
patent: 3763301 (1973-10-01), Civardi et al.
patent: 3769381 (1973-10-01), Konig et al.
patent: 3931437 (1976-01-01), Civardi et al.

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