摘要:
A coupling agent for vulcanizable mixtures of rubbers and mineral fillers which is the reaction product of a 2(3)-chloroacetoxy-5-(2'-trialkoxysilyethyl)norbornane of the formula: ##STR1## wherein R.sup.1 is methyl and/or ethyl, with a thiosulfonic acid salt of the formula:R.sup.2 --SO.sub.2 SMe (II)wherein R.sup.2 is a (cyclo)aliphatic or aromatic hydrocarbon radical having up to 20 carbon atoms, and Me is sodium or potassium.
摘要:
Novel adhesion promoters having, on the one hand, groups capable of forming a stable chemical bond with the surface of silicic acids and silicates (siloxane bond) and, on the other hand, groups capable of forming, during vulcanization, a stable chemical bond with an elastomer (sulfur bridges) are provided. They are consequently suitable as adhesion promoters for the production of vulcanizates exhibiting a favorable filler/elastomer bond. They are oligosulfanes of the formula(RO).sub.3 Si--Y--S.sub.x --Y--Si(OR).sub.3wherein R, Y and x are defined herein, or a mixture of an oligosulfane of this formula (main product) and of a structurally related, substantially dimeric condensation product, which is characterized by a siloxane bond (by-product).
摘要:
A process for producing a shelf-stable ethylene-.alpha.-olefin (diene) elastomer powder which comprises a release agent, comprising grinding crumbs or preliminarily comminuted particles of an ethylene-.alpha.-olefin (diene) elastomer having a green strength of 5-20 MPa and a Mooney viscosity ML (1+4) 100.degree. C. of 50-150, and, prior to, during or after the grinding step, adding 0.5-10 parts by weight per 100 parts by weight of the ethylene-.alpha.-olefin (diene) elastomer, of a release agent which is(a) polyethylene of a density of 0.910-0.975 g/cm.sup.3, a viscosity number of 50-330 cm.sup.3 /g and a melt index of 0.2-50 g/10 min, polypropylene of a density of 0.90-0.910 g/cm.sup.3, a viscosity number of 100-1000 cm.sup.3 /g and a melt index of 0.1-50 g/10 min, polybutene-1 of a density of 0.910-0.975 g/cm.sup.3, a viscosity number of 100-1000 cm.sup.3 /g and a melt index of 0.1-100 g/10 min, polyvinyl chloride of a viscosity number of 50-200, all having an average secondary particle size of 5-50 .mu.m;(b) a synthetic amorphous silicic acid (SiO.sub.2) having an average primary particle size of 0.01-0.2 .mu.m and an average secondary particle size of 5-35 .mu.m; a naturally occurring silicic acid, at least 65% by weight of which has an average primary particle diameter of
摘要:
A homo- or copolymer of a 1,3-diene having reactive silyl groups bound thereto, and containing 0.4-12% by weight of bound silicon, prepared by reacting at a temperature of 150.degree.-300.degree. C., a 1,3-diene homo- or copolymer, having less than 1% of its aliphatic double bonds conjugated and having a molecular weight (M.sub.n) of 400-8,000, with a silicon compound of the formula ##STR1## wherein R is an unsaturated aliphatic hydrocarbon residue of 2-20 carbon atoms,X is halogen, C.sub.1-6 alkoxy, C.sub.1-6 alkoxyalkoxy, C.sub.6-12 aryloxy, C.sub.1-8 alkanoyloxy, C.sub.1-6 ketoximato or C.sub.1-8 hydrocarbylamido,Y and Z independently are one of the X groups, hydrogen, alkyl of 1-8 carbon atoms, cycloalkyl of 5-12 carbon atoms, or optionally substituted phenyl.
摘要:
A process for the silylation of unsaturated, naturally occurring oils or the interesterification products thereof, comprises reacting the unsaturated, naturally occurring oils or the interesterification products thereof, at a temperature of 200.degree.-350.degree.C. under inert gas, with silicon compounds of Formula I ##STR1## wherein R is hydrogen or an unsaturated aliphatic hydrocarbon residue of 2-6 carbon atoms,X is a hydrolyzable residue, andY and Z independently are one of the X groups, alkyl of 1-8 carbon atoms, cycloalkyl of 5-12 carbon atoms, or optionally substituted phenyl.