Process for forming a cured article of consistent shape from an

Details Process for forming a cured article of consistent shape from an Process for forming a cured article of consistent shape from an

1994-01-21

1995-03-28

Marquis, Melvyn I.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523212, 264178R, 264183, 264236, 264247, C08K 906

Patent

active

054017815

ABSTRACT:
A process for forming a cured article of consistent shape from a hydrolyzable siloxane composition without the problem of non-uniformity that results from significant die swell upon extrusion and from shrinkage upon curing. The present process comprises extruding a non-self-supporting composition maintained at a temperature greater than 5.degree. C. The composition comprises a polydiorganosiloxane having at least two silicon-bonded hydrolyzable groups per molecule, a hydrolyzable silicon crosslinker, a filler, and optionally a curing catalyst. The composition is extruded at a constant rate through a shaping die to form a shaped extrusion having a cross-sectional area that is substantially uniform throughout the length of the shaped extrusion. The shaped extrusion is fed in a continuous flow into an aqueous curing bath which is maintained at a temperature of at least 20.degree. C. and which has a density substantially the same as or slightly greater than the density of the shaped extrusion. The shaped extrusion is moved through the aqueous curing bath at a constant rate as the shaped extrusion cures into a cured article having a cross-sectional area that is substantially uniform throughout the length of the cured article.

REFERENCES:
patent: 3184427 (1965-05-01), Russell et al.
patent: 3849462 (1974-11-01), Lengnick
patent: 4075154 (1978-02-01), Itoh et al.
patent: 4683251 (1987-07-01), Mikami
patent: 4783289 (1988-11-01), Shimizu et al.
EP 409079 Abstract only, publication date: Jan. 23, 1991.
The Handbook of Silicone Rubber Fabrication, W. Lunch, van Nostrand Reinhold Co. New York, N.Y. (1978).
Fabricating with Silastic.RTM. brand rubber, Bulletin 17-053a of Dow Corning Corporation (9-73).

Affiliated with

Also associated with

Rating

Process for forming a cured article of consistent shape from an does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for forming a cured article of consistent shape from an , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for forming a cured article of consistent shape from an will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2250985