Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1990-04-20
1991-12-17
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524161, 524166, 524745, 524746, 524787, 524788, 524860, 524863, C08K 541
Patent
active
050735861
ABSTRACT:
The specification discloses a curable composition comprising 100 parts by weight of polysiloxane, 50 to 200 parts by weight of finely divided filler having an average particle size greater than 0.05 micron and not less than 0.5 parts by weight per 100 parts by weight of the filler of an additive which is a reaction product of an organic amine, or an oxide, hydroxide, carbonate, or bicarbonate or a mixture thereof with a sulphonic acid of the formula RSO.sub.3 H in which R represents a hydrocarbon group which may have halogen or amino substituents and which contains not less than six carbon atoms. Preferred additives are reaction products of the sulphonic acid and an oxide, hydroxide, carbonate or bicarbonate of sodium, magnesium, zinc, calcium, barium, aluminium or a mixture thereof. The group R of the sulphonic acid may be R'C.sub.6 H.sub.4 where R' represents an alkyl group having 6 to 18 carbon atoms and a preferred acid is dodecylbenzenesulphonic acid. The filler is preferably basic and may be oxide, hydroxide, carbonate or bicarbonate of calcium, magnesium, barium or zinc or a mixture thereof. Preferably the polysiloxane corresponds to a mixture and/or a reaction product of a polydiorganosiloxane HO(R".sub.2 SiO).sub.x H with a compound containing silicon-bonded groups which are reactive therewith under the influence of moisture.
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Berthet Michelle M. N. C.
Trego Brian R.
Wessely Hans-Juergen
Dean Jr. R.
Dow Corning S.A.
Elliott Edward C.
Marquis Melvyn I.
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