摘要:
Organopolysiloxanes of the formula ##STR1## in which R is an alkyl radical having 6 to 18 C atoms,R' is an alkyl radical having 1 to 7 C atoms or the phenyl radical,a and b each independently is an integer from 1 to 500, the ratio of b:a being at least 2, are miscible with mineral oil and synthetic lubricating oils and have a pour point below -15.degree. C.
摘要:
An aqueous emulsion, having a long shelf life, of a low molecular weight silicone resin comprising by weight(a) 1-60% of a silicone resin of the formula ##EQU1## wherein R.sup.1 is a monovalent hydrocarbon radical having 1 -14C atoms,R.sup.2 is a monovalent hydrocarbon radical having 1 -18C atoms,x has a value from about 0.75 to 1.5 andy has a value from about 0.2 to 2.0,and having a viscosity of about 2 to 2000 mPa.s,(b) 0.1-10% of an emulsifier, and(c) water.Advantageously two non-ionic emulsifiers are used in combination.
摘要:
A storage-stable aqueous emulsion of a low molecular weight, alkoxy-functional silicone resin by weight comprising approximately(a) 1-60% of a silicone resin having a viscosity of from 2 to 2000 mPa.s and of the formula ##EQU1## in which R.sup.1 is a monovalent hydrocarbon group having 1 to 14 carbon atoms,R.sup.2 is a monovalent hydrocarbon group having 1 to 18 carbon atoms,x is from 0.75 to 1.5, andy is from 0.2 to 2,(b) 0.1 to 10% of an emulsifying agent, and(c) 30 to 98.5% by weight of water, the emulsion having an alkaline pH, whereby the storage stability due to reduced hydrolysis is improved.
摘要:
An organopolysiloxane of the formula ##STR1## in which x=0 to 500,y=5 to 500,z=5 to 500,R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 independently of one another, represent a saturated and/or unsaturated, optionally also branched alkyl radical having 1 to 4 C atoms, and/or an aryl radical having 6 to 9 C atoms, which may also be optionally alkyl-substituted,R.sub.7 represents an alkyl radical having 6 to 18 C atoms,and in which in each case at least 3% of the radicals bonded to Si are R.sub.7 and H. They are reactive with substrates and thus wash-resistant.
摘要:
A silicone emulsion which can be converted into an elastomeric product under ambient conditions by eliminating and evaporating water and alcohol or carboxylic acid, comprising by weight approximately(A) 100 parts of a hydroxyl-terminated polydiorganosiloxane having a molecular weight of at least about 50,000,(B) 1 to 400 parts of a low molecular weight, reactive acyloxy or alkoxy-functional silicone resin,(C) 0.1 to 20 parts of a catalytic compound,(D) 0 to 200 parts of a thixotropic filler and(E) 0 to 200 parts by weight of a non-thixotropic filler, the silicone emulsion having a solids content of about 20 to 85% by weight. The emulsion is especially suited for coatings and sealants.
摘要:
The present invention relates to mixtures comprising at least one polysiloxane defoamer, at least one emulsifier, at least one nonionic surfactant, at least one polyurethane thickener and water, to a process for the production thereof and to the use thereof.
摘要:
Silicone rubbers in the form of crosslinked, particulate particles can be used as a grafting base for the preparation of thermoplastic moulding materials having good low-temperature impact strength and resistance to weathering-ageing, after they are provided with an intermediate shell of crosslinked acrylate rubber.
摘要:
The subject of the present invention is a process for the preparation of polydiorganosiloxanes containing hydroxyaryloxy terminal groups by reacting polydiorganosiloxanes containing bis-acyloxy terminal groups with diphenols in a molar ratio of 1:2 to 1:20.
摘要:
Electroviscous fluids are disclosed which are composed of aluminum silicates particles in an electrically non-conductive liquid and a suitable dispersing agent. The atomic ratio of Al/Si on the surface of the aluminum silicate lies within the range of 0.15 to 0.80.