摘要:
A curable epoxy resin is blended with (a) an alkenyl group-containing epoxidized novolak resin/organopolysiloxane copolymer and (b) a polyimide resin in addition to a curing agent and an inorganic filler. The resulting epoxy resin composition can be cured both under moisture-free conditions and even under moist conditions without inducing a crack. It is suitable for the encapsulation of semiconductor devices as well as for molding and powder coating.
摘要:
A foamable silicone rubber composition, comprising:(A) a polyorganosilphenylenesiloxane copolymer represented by Formula (I): ##STR1## wherein R.sup.1 and R.sup.2 are each a particular monohydrocarbon group, and a and h are each an integer of 1 or more and have the relation of 1.gtoreq.a/b.gtoreq.0.05 and a+b.gtoreq.100,(B) an organosilicon compound containing a particular organosiloxy unit having a hydroxyl group,(C) a polyorganohydrogenosiloxane having at least two particular units having an Si--H bond, and(D) a platinum family metal catalyst.This composition can provide a foam with good mechanical strength.
摘要:
A silicone rubber composition composed of a high-molecular diorganopolysiloxane, a reinforcing silica filler and an organic peroxide as a curing agent is further compounded with a fluorine-containing low-polymeric compound such as poly(chlorotrifluoroethylene) and perfluorinated polyether compound of the formula F--[--CF(CF.sub.3)--CF.sub.2 --O--].sub.v --O--CF.sub.2 --CF.sub.3, in which v is 2 to 100, as well as fluoroalkyl-substituted organopolysiloxanes. The silicone rubber composition can give a cured silicone rubber product having greatly improved resistance against dynamic fatigue as in repeated cycles of stretching and relaxation.
摘要:
The silicone rubber composition of the invention comprises, as the peroxide curing agent, a neopentane diol derivative represented by the general formulaR.sup.1 --O--O--CO--O--CH.sub.2 --C(CH.sub.3).sub.2 --CH.sub.2 --O--CO--O--O--R.sup.2,in which R.sup.1 and R.sup.2 are each, independently from the other, a monovalent hydrocarbon group having 3 to 10 carbon atoms or a silyl group of the general formula --SiR.sup.3.sub.3, R.sup.3 being a methyl, ethyl or phenyl group, such as trimethyl silyl, in admixture with a diorganopolysiloxane and a reinforcing silica filler. By virtue of this unique formulation, the silicone rubber composition is suitable for hot-air vulcanization without compression as in the vulcanization process by extrusion molding followed by heating in a hot-air oven.
摘要:
In a TRS (twin ridge substrate) type semiconductor laser, reflectivity at both facets of the resonator at the oscillation wavelength is selected to be higher than the reflectivity of the semiconductor crystal of the laser device, but smaller than 1, thereby stabilizing the light oscillation with a low S/N ratio.
摘要翻译:在TRS(双脊衬底)型半导体激光器中,选择谐振器在振荡波长处的两个面处的反射率高于激光器件的半导体晶体的反射率,但小于1,从而稳定光振荡 S / N比低。
摘要:
Vulcanizates of so-called EPM and EPDM rubber compositions can be imparted with greatly improved flame retardancy and emit a greatly decreased volume of smoke in burning when the rubber composition is compounded with a conventional flame retardant agent of aluminum or magnesium hydroxide together with a polymer of an acrylic acid ester and an organopolysiloxane in combination or a copolymer composed of the moieties of these two kinds of monomeric units in a limited weight proportion.
摘要:
The inventive copolymer composition is satisfactorily curable or vulcanizable into, for example, a rubbery elastomer even by an organic peroxide contained therein as a crosslinking agent. The crosslinkable copolymer comprised therein is a polymer having, in a molecule, at least two monomeric units each having a vinyl-containing organosilicon pendant group represented by the general formula (Vi.sub.m R.sup.1.sub.n SiO).sub.a Vi.sub.b R.sup.2.sub.c Si--, in which Vi is a vinyl group, R.sup.1 is a hydrogen atom or a group selected from the class consisting of monovalent hydrocarbon groups free from aliphatic unsaturation, hydroxy group and hydrolyzable groups excepting halogen atoms, R.sup.2 is a hydrogen atom or a monovalent hydrocarbon group, m is 1, 2 or 3, n is zero, 1 or 2, a is 1, 2 or 3, b is zero, 1 or 2 and c is zero, 1 or 2 with the proviso that a+b=1, 2 or 3 and a+b+c=3. Such a copolymer can be prepared by the copolymerization of a first ordinary ethylenically unsaturated monomer and a second monomer having, simultaneously in a molecule, an ethylenically unsaturated linkage copolymerizable with the first monomer and the vinyl-containing organosilicon group of the above given formula.
摘要翻译:本发明的共聚物组合物甚至可以通过其中含有的有机过氧化物作为交联剂令人满意地固化或硫化成例如橡胶弹性体。 包含在其中的可交联共聚物是分子中具有至少两个单体单元的聚合物,每个单体单元具有由通式(VimR1nSiO)aVibR2cSi-表示的含乙烯基的有机硅侧基,其中Vi是乙烯基,R1是 氢原子或选自不含脂肪族不饱和键的一价烃基,羟基和除卤素原子外的可水解基团的基团,R 2为氢原子或一价烃基,m为1,2或3,n为0 ,1或2,a为1,2或3,b为0,1或2,c为0,1或2,条件是a + b = 1,2或3,a + b + c = 3。 这种共聚物可以通过共聚第一普通烯键式不饱和单体和第二单体来制备,该单体在分子中同时具有可与上述给定式的第一单体和含乙烯基的有机硅基团共聚的烯属不饱和键。
摘要:
The rubber composition is formulated with (A) a combination of an ethylene-propylene copolymeric rubber and an organopolysiloxane having at least two alkenyl groups per molecule as the polymeric base, (B) a reinforcing silica filler, (C) an alkoxysilane compound and (D) a thiocarbamyl-containing organosilane compound. The rubber composition can be vulcanized with an organic sulfur compound or organic peroxide as the vulcanizing agent to give a vulcanizate having quite satisfactory mechanical properties including, in particular, greatly improved heat resistance and greatly decreased permanent compression set even without using carbon black as the reinforcing filler. The omission of carbon black in the formulation gives an advantage that the rubber may be colored in any light color.