摘要:
A co-grafted polymer dispersion comprising blocks of an organopolysiloxane with OH functional groups, blocks of an ethylene/vinyl ester copolymer containing about 5 to 99% by weight of incorporated vinyl ester, and blocks of vinyl monomer units polymerized in the presence of mixtures of the organopolysiloxane and ethylene/vinyl ester copolymer, the organopolysiloxane and ethylene/vinyl ester copolymer blocks being linked via vinyl polymer bridges. The dispersions mixed with suitable catalysts, can cure under the influence of atmospheric moisture to elastic tack-free rubbers suitable as sealants.
摘要:
A graft copolymer comprising (I) as a first polymeric moiety an organopolysiloxane with OH functional groups, (II) as a second polymeric moiety a polyether, and (III) units of vinyl monomer which have been polymerized in the presence of mixtures of the first and second polymeric moieties which moieties are linked via vinyl polymer bridges, is produced by polymerizing a suitable monomer dispersion. The product is suited for replacing all or some of the organopolysiloxane component in room temperature curable compositions containing organopolysiloxanes, silane cross-linking agents and a curing catalyst.
摘要:
The invention relates to special stable dispersions which crosslink at room temperature upon exposure to moisture in the atmosphere. The dispersions comprise polysiloxanes, vinyl-grafted polysiloxanes and condensation products, e.g. by weight approximately comprisingI. 20-90% of at least one diorganopolysiloxane optionally terminated by OH,II. 5-85% of at least one aliphatic or mixed aliphatic/aromatic polycondensation product or polyaddition product, polyether, or vinyl polymer with a glass temperature T.sub.G of up to 40.degree. C. and/or a vinyl monomer-grafted derivative thereof, andIII. 5-85% of at least one organopolysiloxane modified by grafting with at least one vinyl monomer and comprising(A) 10-90% of a diorganopolysiloxane optionally terminated by OH,(B) 10-90% of polymerized units of at least one vinyl compound, and(C) 0-80% of at least one aliphatic or mixed aliphatic/aromatic polycondensation product or polyaddition product, polyether, or vinyl polymer with a glass temperature T.sub.G of up to 40.degree. C.
摘要:
A co-grafted polymer comprising units of organopolysiloxanes with OH functional groups, polyesters and vinyl monomers, polymeric units of the vinyl monomers being linked to the organopolysiloxane and polyester units, is produced by polymerizing a suitable monomer dispersion. The product is suited for replacing all or some of the organopolysiloxane component in room temperature curable compositions containing organopolysiloxanes, silane cross-linking agents and a curing catalyst.
摘要:
A graft copolymer comprising (I) as a first polymeric moiety an organopolysiloxane with OH functional groups, (II) as a second polymeric moiety a polyester-urethane and, (III) units of vinyl monomers, units of the first and second polymeric moieties being linked via vinyl polymer bridges, all these units having been polymerized in the presence of mixtures of the first and second polymeric moieties, is produced by polymerizing a suitable monomer dispersion. The product is suited for replacing all or some of the organopolysiloxane component in room temperature curable compositions containing organopolysiloxanes, silane cross-linking agents and a curing catalyst.
摘要:
In a sheet coated on both surfaces with non-stick coatings, one of the coatings being more non-stick than the other, the improvement which comprises employing as the lesser non-stick coating a composition according to claim 1 by weight consisting essentially of(A) about 10 parts of a polyorganosiloxane with hydroxyl end groups and with a viscosity of 10.sup.2 to 5.10.sup.4 Pas,(B) 0.5-5 parts of at least one cross-linking agent of the formulaRSiX.sub.3whereinX is a hydrolyzable group andR is an alkyl, alkenyl, aryl or aminoalkyl group with 1-12 C atoms,(C) 0.1-2 parts of an organic tin compound as the catalyst and(D) 100-500 parts by weight of an organic solvent, the improvement which comprises additionally including, and(E) 0.1-20 parts of a graft copolymer comprising(i) 25-75% of an essentially linear polyorganosiloxane with hydroxyl end groups and with a viscosity of 100 to 500,000 mPas and(ii) 10-70% of at least one organic polymer with a molecular weight of 500 to 100,000, linked to (i) via bridges formed on polymerization of(iii) 10-60% of one or more monomers containing at least one aliphatic double bond.
摘要:
A chemically linkable mixture comprising(a) about 98 to 80% by weight of a fluoroelastomer bearing lateral olefinic double bonds,(b) about 2 to 20% by weight of at least one of a silicone oligomer, silicone elastomer and a fluorosilicone elastomer containing Si--H groups, and(c) a catalyst containing at least one of a noble metal and an organic peroxide.Fluororubbers made therefrom are distinguished by excellent physical properties.
摘要:
A molding composition containing a graft polymer is disclosed. The graft is a product of a free-radical emulsion polymerization of resin-forming vinyl monomers in the presence of rubber present in latex form having a glass transition temperature of ≦0° C. using an initiator combination comprising a persulfate compound and a redox initiator system. The process for preparing the graft polymer entails adding the persulfate compound at the beginning of the graft polymerization reaction and a later addition of the redox initiator. The composition that features good gloss and flowability is suitable for the preparation of molded articles.
摘要:
A thermoplastic molding composition that exhibits antistatic properties and improved color stability is disclosed. The composition contains a major amount of resinous component that contains A) 0 to 100 % by weight of one or more graft polymers B) 100 to 0 % by weight of a thermoplastic vinyl (co)polymer, and a minor amount of a mixture of a) a modified or unmodified polyalkylene ethers and b) a phenolic oxidant wherein the weight ratio (a):(b) is 20:1 to 1:1.
摘要:
Thermoplastic moulding compositions containingA. a thermoplastic polymer andB. 0.1 to 50% by weight, with respect to A, of an inorganic substance with an average particle diameter of 0.1 to 100 nm,and the use of superfine inorganic substances as defined by B for increasing the X-ray contrast of thermoplastic moulding compositions comprising A and B.