摘要:
Copolymers selectively hydrogenated on the olefinic double bond and composed ofA) 50 to 65% by weight styrene,B) 35 to 50% by weight butadiene andC) 0 to 5% by weight other copolymerizable monomers are used in cosmetic and pharmaceutical compositions.
摘要:
Copolymers of monoalkyl maleates and vinyl alkyl ethers are prepared by free radical copolymerization of maleic anhydride and a vinyl alkyl ether followed by reaction with an alkanol, by a process in which the vinyl alkyl ether component is present in excess in the reaction mixture in each phase of the polymerization, the free radical copolymerization is carried out in acetone and the acetone is removed by distillation during or after ester formation at up to 70.degree. C.
摘要:
A process for the preparation of 1,3-disubstituted 4,5-cis-dicarboxy-2-imidazolidones useful as intermediates in the preparation of Vitamin H (biotin), said intermediates have the general formula ##STR1## in which R is an aliphatic hydrocarbon radical having 1 to 8 carbon atoms, an aralkyl radical or an aromatic hydrocarbon radical, preferably an allyl radical or a benzyl radical, comprising reacting a defined diaminosuccinic acid with phosgene in the presence of an alkali metal hydroxide.
摘要:
Polymers are obtained by polymerization of water-soluble monomers which contain one or more polymerizable olefinic double bonds and a quaternary nitrogen atom which is substituted by one or more hydroxyalkyl groups and are present in the form of halide-free salts, with or without further comonomers.
摘要:
The invention relates to intermediate compounds having the general formula I ##STR1## in which R.sup.1 is H, an alkyl, arylalkyl or an aliphatic acyl radical, preferably a benzyl or acetyl group and wherein X and Y together span an additional bond between the X and Y carrying C atoms (Ia) or in which Y is OH and X is H (Ib) and in which the dotted line can represent an additional bond particularly[2R,1'Z,3'E,7'E]-6-benzyloxy-2,5,7,8-tetramethyl-2-(4',8',12'-trimethyl-trideca-1',3',7'-trien-1'-yl)chroman and6-benzyloxy-2,5,7,8-tetramethyl-2-(1'-hydroxy-4',8',12'-trimethyl-trideca-3',7'-diene-1'-yl)chroman, as well as compounds and methods of preparing compounds having the general formula II ##STR2## in which Z is one of the groups ##STR3## wherein R.sup.2 is an alkyl group with 1 to 4 carbon atoms preferably CH.sub.3 or C.sub.2 H.sub.5particularly (3,7,11-trimethyl-trideca-2,6,10-trien-1-yl)triphenylphosphonium chloride and (3,7,11-trimethyl-trideca-2,6,10-trien-1-yl) phosphoric acid dimethylester as well as methods for the preparation of (2R,4'RS,8'Rs)-.alpha.-tocopherol and (all-rac)-.alpha.-tocopherol via the new intermediate product.
摘要:
Chroman derivatives of the general formula I ##STR1## where A--B is --CH.sub.2 --CH.sub.2 --(Ia), --CH.dbd.CH--(Ib), --CHOH--CH.sub.2 --(Ic) or --CO--CH.sub.2 --(Id), R.sup.1 is --CH.sub.2 --O--R' or ##STR2## where R' is C.sub.1 -C.sub.4 -alkyl or arylmethyl and R" and R'" are each C.sub.1 -C.sub.4 -alkyl, which can also be bonded to form a five-membered or six-membered cyclic acetal, R.sup.2 is C.sub.1 -C.sub.4 -alkyl and R.sup.3 is H or a protective group.
摘要:
Disclosed is a device for cooling a body or body part for medical or performance-enhancing purposes, said device consisting of one or more cooling elements (11), said cooling element (11) being provided with a cover (1) that is filled with meltable cooling solid (2). The disclosed device is characterized in that an additional apparatus for displacing the already melted portion (8) of the cooling solid (2) from the contact surface (7) to the body is provided inside the cover (1), the expandable member (4, 6) being preferably designed in the form of a filled member (4) of a spring element (6) or of a foamed article. Also disclosed is an additional device which is characterized in that a layer (16) of thermochromic material indicates when a threshold temperature is exceeded, said layer (16) being applied to the bottom side of the expandable member and thus being pressed against the remaining solid portion of the cooling solid, the cover (1) being transparent in this case.
摘要:
Disclosed is a device for cooling a body or body part for medical or performance-enhancing purposes, said device consisting of one or more cooling elements (11), said cooling element (11) being provided with a cover (1) that is filled with meltable cooling solid (2). The disclosed device is characterized in that an additional apparatus for displacing the already melted portion (8) of the cooling solid (2) from the contact surface (7) to the body is provided inside the cover (1), the expandable member (4, 6) being preferably designed in the form of a filled member (4) of a spring element (6) or of a foamed article. Also disclosed is an additional device which is characterized in that a layer (16) of thermochromic material indicates when a threshold temperature is exceeded, said layer (16) being applied to the bottom side of the expandable member and thus being pressed against the remaining solid portion of the cooling solid, the cover (1) being transparent in this case.
摘要:
3-Methyl-1-vinylimidazolium chlorides are prepared by quaternizing N-vinylimidazoles in aqueous solution with methyl chloride and are used for the preparation of water-soluble homo- or copolymers.
摘要:
A terpolymer of vinylpyrolidone, tert-butyl (meth)acrylate and acrylic or methacrylic acid, its use in hair treatment agents, and hair cosmetics compositions which contain these agents.