Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Reexamination Certificate
1999-02-24
2001-04-17
Dawson, Robert (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
C528S015000, C528S017000, C528S018000, C528S019000, C528S021000, C528S034000, C528S901000, C524S860000, C524S448000, C524S401000, C524S403000, C524S430000, C524S431000, C524S423000, C524S425000, C524S588000, C525S100000
Reexamination Certificate
active
06218495
ABSTRACT:
TECHNICAL FIELD
The invention relates to a three-stage process for the continuous preparation of RTV-1 compositions.
BACKGROUND ART
One component organopolysiloxane compositions which can be stored with exclusion of moisture and crosslink at room temperature on admission of moisture, known as RTV-1 compositions, have been known for a long time.
In the preparation of the RTV-1 compositions, not all constituents can be added in one step; rather, after mixing part of the constituents, a certain reaction time is necessary before further constituents are mixed in. Two-stage processes have been developed for this purpose. For example, in EP-A-234 226, part of the constituents are combined in a first step in a continuous closed mixer, and in a second step in a reciprocating kneader, the remaining constituents are metered in and the composition is homogenized and degassed under reduced pressure in this kneader.
RTV-1 compositions are compounded to form many different products for various applications which differ, for example, in terms of color, transparency or viscosity. In the process of EP-A-234 226, when the product is changed, for example in the case of a color change, the entire reciprocating kneader has to be cleaned or at least generously purged with the composition according to the changed formulation. This is associated with large product losses.
DISCLOSURE OF INVENTION
It is an object of the invention to provide a process for the continuous preparation of RTV-1 compositions in which a change of formulation results in only small losses of time and of RTV-1 composition.
REFERENCES:
patent: 5789480 (1998-08-01), Adachi et al.
patent: 6031026 (2000-02-01), Tateyama et al.
patent: 1 252 939 (1989-04-01), None
patent: 41 03 602 A2 (1992-08-01), None
patent: 0 234 226 A2 (1987-09-01), None
patent: 0 234 226 (1992-04-01), None
patent: 1174219 (1969-12-01), None
Derwent Abstract corr. to EP 0234226 (AN 87-206958).
Derwent Abstract corr. to DE 4103602 (AN 92-277301).
Braun Rudolf
Felber Thomas
Steiner Johann
Trajer Werner
Wohrl Helmut
Brooks & Kushman P.C.
Dawson Robert
Robertson Jeffrey B.
Wacker-Chemie GmbH
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