Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1990-02-09
1990-10-09
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524729, 524425, C08K 318
Patent
active
049621521
ABSTRACT:
The specification describes and claims curable polysiloxane compositions filled with a mixture of two types of finely divided calcium carbonate. The curable polysiloxane comprises 100 parts by weight of a hydroxypolysiloxane with from 5 to 12 parts by weight of a curing agent therefore comprising a silane of the formula R.sub.a R'.sub.b Si or a siloxane having units ##EQU1## wherein each R represents a monovalent hydrocarbon group, each R' represents an hydroxy, alkoxy, or alkoxyalkoxy group, a+b=4, a has a value 0 or 1, b has a value 3 or 4, c has a value 1, 2 or 3 and a+c is not greater than 3 as exemplified by methyl trimethoxy silane, together with a catalytic amount of a titanium or tin compound for promoting curing of the product in presence of moisture of the atmosphere. The composition contains, per 100 parts by weight of the polysiloxane, from 50 to 200 parts by weight of a filler comprising a mixture of 10 to 80% by weight of the mixture of a calcium carbonate composed principally of particles having a surface area from 10 m.sup.2 /g to 30 m.sup.2 /g and 20 to 90% by weight of the mixture of a calcium carbonate composed principally of particles having a surface area from 0.5 m.sup.2 /g to 12 m.sup.2 /g. The compositions are applicable as sealant compositions having a desirable blend of properties including adhesion to various surfaces.
REFERENCES:
patent: 4585821 (1986-04-01), Progneaux et al.
patent: 4888380 (1989-12-01), Kamis et al.
Borrousch Roger H.
Dow Corning S. A.
Hellender Karen A.
Marquis Melvyn I.
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