摘要:
The invention relates to a hydrogel polymer produced by polymerising an acrylic acid ester with an N vinylpyrrolidene and is characterised in that less than 100 % copolymer ester groups are saponified in such a way that free carboxyl groups are formed. The inventive hydrogel polymer makes it possible to produce reliable long-lasting implants which are used, in particular, for increasing breast or filling cutaneous wrinkles, are adaptable to each application and have a sufficiently high swelling coefficient is.
摘要:
The invention relates to a hydrogel polymer produced by polymerising an acrylic acid ester with an N vinylpyrrolidene and is characterised in that less than 100 % copolymer ester groups are saponified in such a way that free carboxyl groups are formed. The inventive hydrogel polymer makes it possible to produce reliable long-lasting implants which are used, in particular, for increasing breast or filling cutaneous wrinkles, are adaptable to each application and have a sufficiently high swelling coefficient is.
摘要:
Method of producing high molecular weight copolymers from vinyl monomers such as vinylpyridine and styrene by emulsion polymerization which comprises combining the monomers with a particular surfactant, a polymerization initiator in an aqueous medium at a solids level of 5-50% by weight, and carrying out the polymerization at a pH of 10-14 at a temperature of 40-90oC until the conversion is greater than 90%.
摘要:
Stable water based High-Temperature-High-Pressure (HTHP) and/or Non-HTHP crosslinked copolymers for oil and gas applications consist of (i) a crosslinked, linear polyvinyl amide/polymerizable carboxylic acid) copolymer, having a composition, by weight, of 25-75 wt. % of a vinyl amide monomer selected from vinyl pyrrolidone, vinyl caprolactam, N-vinyl-N-methylacetamide and mixtures thereof, and 25-75 wt. % of a polymerizable carboxylic acid monomer selected from acrylic acid, (meth)acrylic acid, crotonic acid, itaconic acid, maleic acid and mixture thereof; and (ii) a crosslinker in an amount of 0.01-5% based on weight of total monomers. Also discloses relevant compositions comprising said copolymer and method of use thereof.
摘要:
Provided is a wet pressure-sensitive adhesive composition which comprises, as a component A, at least one compound selected from the group consisting of polyvinyl pyrrolidone, a vinyl pyrrolidone.vinyl acetate copolymer, polyethylene oxide and the half ester of a methyl vinyl ether.maleic anhydride copolymer; as a component B, a liquid plasticizer compatible with the component A; and as a component C, a filler. The combination of the component C with components A and B makes it possible to provide a wet pressure-sensitive adhesive composition which exhibits tackiness in the presence of water or a hydrophilic medium, adheres well to the application site, dries speedily after adhesion, has high mechanical strength after drying and can be peeled off easily. The wet pressure-sensitive adhesive composition is therefore useful as a facial pack material such as peel-off pack for the removal of horny plugs formed in the skin pores or a skin covering material for the moist or wet skin surface.
摘要:
Stable water based High-Temperature-High-Pressure (HTHP) and/or Non-HTHP crosslinked copolymers for oil and gas applications consist of (i) a crosslinked, linear polyvinyl amide/polymerizable carboxylic acid) copolymer, having a composition, by weight, of 25-75 wt. % of a vinyl amide monomer selected from vinyl pyrrolidone, vinyl caprolactam, N-vinyl-N-methylacetamide and mixtures thereof, and 25-75 wt. % of a polymerizable carboxylic acid monomer selected from acrylic acid, (meth)acrylic acid, crotonic acid, itaconic acid, maleic acid and mixture thereof; and (ii) a crosslinker in an amount of 0.01-5% based on weight of total monomers. Also discloses relevant compositions comprising said copolymer and method of use thereof.