Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Utility Patent
1998-08-26
2001-01-02
Moore, Margaret G. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
C528S035000, C556S434000
Utility Patent
active
06169156
ABSTRACT:
BACKGROUND OF INVENTION
The invention is a novel branched siloxane-silalkylene copolymer containing a plurality of silicon-bonded hydrogen atoms or silicon-bonded alkoxy groups in the molecule. The copolymers are used to improve properties, such as, mechanical strength, adhesiveness, and durability of an end product.
Organosilicon polymers containing a plurality of silicon-bonded hydrogen atoms in the molecule are used as crosslinkers in hydrosilylation-based crosslinking reactions and as precursors in the synthesis of functional organosilicon polymers. Recently a desire has arisen in this area for the development of novel crosslinkers that would have higher crosslinking efficiencies and would result in the production of cured articles with excellent mechanical strength, adhesiveness, and durability properties. The result has been the appearance of a variety of organosilicon polymers that contain a plurality of silicon-bonded hydrogen atoms in each molecule (refer to Japanese Patent Application Laid Open (Kokai or Unexamined) Numbers Sho 61-195129 (195,129/1986) and Hei 6-107671 (107,671/1994)). However, even these organosilicon polymers do not provide entirely satisfactory results when used as crosslinkers or precursors.
Organosilicon polymers containing a plurality of silicon-bonded alkoxy groups in the molecule are known to be useful as raw materials for coatings, paints and as crosslinkers for moisture-curing compositions. In the last few years the need has also arisen in this area for the development of highly reactive organosilicon polymers that could be used to improve various properties such as the mechanical strength, adhesiveness, and durability of the end product.
Japanese Patent Application Laid Open (Kokai or Unexamined) Number Hei 7-17981 (17,981/1995) teaches a dendritic organosilicon polymer. The addition reaction between tetravinylsilane and organochlorosilane is disclosed for its synthesis, but the subject organosilicon polymer has little industrial utility because the precursor tetravinylsilane is a unique and highly specialized compound. In addition, while this organosilicon polymer contains silicon-bonded hydrogen, alkoxy cannot be inserted in the subject polymer by the above-described preparative method.
The present invention provides a novel branched siloxane-silalkylene copolymer that contains a plurality of silicon-bonded hydrogen atoms or silicon-bonded alkoxy groups in the molecule used to improve properties, such as, mechanical strength, adhesiveness, and durability of an end product.
SUMMARY OF INVENTION
The present invention relates to the branched siloxane-silalkylene copolymer represented by formula
which R
1
is C
1
to C
10
alkyl or aryl, a is 3 or 4, and X
1
is the silylalkyl group represented by formula at i=1
where R
1
is as previously defined, R
2
is C
2
to C
10
alkylene, R
3
is C
1
to C
10
alkyl, X
i+1
is a hydrogen atom or silylalkyl group, i is an integer with a value from 1 to 10 that specifies the generation of the silylalkyl group, and b
1
is an integer from 0 to 3.
REFERENCES:
patent: 4707531 (1987-11-01), Shirahata
patent: 5929187 (1999-07-01), Yoshitake
patent: 107671 (1994-08-01), None
Dow Corning Toray Silicone Co. Ltd.
Fletcher Melvin D.
Moore Margaret G.
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