摘要:
The present invention relates to a process for the preparation of compounds of the general formula I ##STR1## in which R.sup.1 and R.sup.2 are defined as stated in claim 1, characterized in that a 1,1,1-tris(hydroxymethyl)-(C.sub.2 -C.sub.5)-alkane or 2,2-bis(hydroxymethyl)-1,3-propanediol is reacted with vinylphosphonic anhydride.
摘要:
Alkenylphosphonic and -phosphinic acid esters of 1,1,1-tris(hydroxymethyl)alkanes and of 2,2-bis-hydroxymethyl-1,3-propanediol are useful as cross-linking agents in polymeric hydrogels.
摘要:
The present invention relates to compounds of the general formula I ##STR1## in which R.sup.1, R.sup.1', R.sup.2, A and n are as defined in the description, a process for their preparation, their use and also hydrogels prepared using them.
摘要:
Alkenylphosphonic and -phosphinic acid esters of 1,1,1-tris(hydroxymethyl)alkanes and of 2,2-bis-hydroxymethyl-1,3-propanediol are useful as cross-linking agents in polymeric hydrogels.
摘要:
Salt mixtures made from aluminum phosphinates, aluminum hydroxide and/or aluminum phosphonates and/or aluminum phosphates are thermally stable and are suitable as flame retardants for polymeric molding compositions, in particular for polyesters and polyamides. The use of these salt mixtures is more effective and more cost-effective than the use of aluminum phosphinates alone.
摘要:
The hydrolysis stability of trivalent organic phosphorus compounds of the formula I ##STR1## used as stabilizers for thermoplastics is improved if these compounds are treated with 0.01 to 5% by weight of an oxide, a carbonate, a hydroxide, a bicarbonate or a carboxylate of a metal of groups 1a, 2a, 2b and 7b of the periodic table of the elements. The storage stability and the ease of handling are increased and the discoloration of the stabilized polymers is reduced.
摘要:
The present invention relates to a process for preparing the .alpha. crystal modification of 2,2',2"--nitrilo�triethyltris(3,3',5,5"--tetra--tert--butyl--1,1'--biphenyl--2,2'--diyl) phosphite! (abbreviated as NTTBP) of the formula ##STR1## which comprises dissolving the NTTBP in the form of its melt, its amorphous solid-phase modification or its .beta. crystal modification, hot, at 40 to 100.degree. C., in short-chain ketones having 3 to 7 carbon atoms, such as methyl ethyl ketone or, in particular, acetone, and then initiating crystallization by cooling to room temperature.
摘要:
The present invention relates to phosphorus-modified epoxy resins having an epoxy number from 0 to 1 mol/100 g, comprising structural units which are derived from (A) polyepoxy compounds having at least two epoxy groups per molecule, and (B) phosphinic and/or phosphonic anhydrides. The invention further provides a process for preparing these phosphorus-modified epoxy resins and provides for the use of the resins in producing moldings, coatings or laminates.
摘要:
A process for the preparation of alkyl arylphosphinites of the formula (I) ##STR1## in which R.sup.1 is (C.sub.1 -C.sub.16)-alkyl, cyclohexyl, cyclopentyl, aryl which can also be substituted by halogen, (C.sub.1 -C.sub.6)-alkoxy groups R.sup.2 is aryl which can also be substituted by halogen, (C.sub.1 -C.sub.6)-alkyl, (C.sub.1 -C.sub.6)-alkoxy groups, where R.sup.1 and R.sup.2 together with the phosphorous atom can also form a ring and R.sup.3 is (C.sub.1 -C.sub.4)-alkyl, which comprises reacting halo(aryl) phosphines of the formula (II) ##STR2## in which R.sup.1, R.sup.2 have the meaning given above and X is halogen, with ammonia-containing alcohols of the formula (III) R.sup.3 OH (III) in which R.sup.3 has the meaning given above.
摘要:
The invention relates to a process for preparing phosphorus-containing compounds of the formula I ##STR1## in which R.sup.1 and R.sup.2 are an alkyl radical having 1 to 8 carbon atoms, a cyclohexyl radical, a cyclopentyl radical, an aryl radical or a halogen-, alkyl- or alkoxy-substituted aryl radical, where R.sup.1 and R.sup.2 together with the phosphorus atom can also form a ring, n and m=0 or 1 and R.sup.3 and R.sup.4 are alkyl radicals having 1 to 4 carbon atoms or n=0, m=0 or 1 and R.sup.3 and R.sup.4 are H, by adding compounds of the formula II ##STR2## into dialkyl esters of fumaric acid or of maleic acid of the formula (III) or dialkyl esters of itaconic acid of the formula (IV) ##STR3## in which R.sup.3 and R.sup.4 have the meaning given above, and, optionally reacting an alkyl ester of a phosphorus-containing dicarboxylic acid of the formula (I), where n=0, with water in the presence of catalytic amounts of an acid to give the phosphorus-containing dicarboxylic acid.