Process and apparatus for the preparation of a polyurethane reac

Details Process and apparatus for the preparation of a polyurethane reac Process and apparatus for the preparation of a polyurethane reac

1993-09-09

1995-01-17

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521131, 521133, 528 44, 528 48, 422135, 366168, 366279, C08L 7500

Patent

active

053826035

ABSTRACT:
The variations in the delivery rate of additive caused by fluctuations in a system for the preparation of a polyurethane reaction mixture from flowable reactants and an additive, in particular a blowing agent, are kept within negligible limits by subdividing the supply pipe (4) to the mixing head (6) into a main pipe (8) and a subpipe (9) and introducing the additive into the side stream, which is substantially smaller than the main stream.

REFERENCES:
patent: 3230047 (1966-01-01), Weinbrenner et al.

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