Process for the preparation of polyurethane films for blood or i

Details Process for the preparation of polyurethane films for blood or i Process for the preparation of polyurethane films for blood or i

1987-06-29

1989-03-07

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642102, 2642105, 264284, 425385, B29C 5904

Patent

active

048104515

ABSTRACT:
Process for the preparation of translucent matt polyurethane films with a rough surface by extrusion of thermoplastic polyurethane elastomers to flat films or tubular films, characterized in that the extruded film is stored until it has a turbidity of > 15%, measured in accordance with ASTM D 1003, and the two film surfaces are then embossed with the aid of embossing rolls with a different number of grids, each in the range from 20 to 100 grids/cm.sup.2, under a pressure of 5 to 20 bar at temperatures of 130.degree. to 175.degree. C.

REFERENCES:
patent: 3060515 (1962-10-01), Corbett
patent: 3233025 (1966-02-01), Frye et al.
patent: 3423274 (1969-01-01), Lahm et al.
patent: 3624045 (1971-11-01), Stivers
patent: 3857144 (1974-12-01), Bustin
patent: 3966383 (1976-06-01), Bussey, Jr. et al.
patent: 3994654 (1976-11-01), Chyu
patent: 4245081 (1981-01-01), Quiring et al.

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