Back to results
US 4,053,504 AGranted
Stabilized acrylic acid esters of polyhydric alcohols and a process for their preparation
AssigneeBayer Aktiengesellschaft
InventorsHans Jurgen Rosenkranz, Hans Rudolph, Gerhard Apel
Life of this patent
Estimating the term…
Abstract
Stabilized acrylic acid esters of polyhydric alcohols which contain as stabilizers polymerisation inhibitors including small amounts of compounds of the styrene type show a non-reduced polymerisation reactivity.
Claims8
A composition comprising an acrylic acid ester of a polyhydric alcohol stabilized by
- a. 0.01 to 0.3% by weight, based on the weight of said ester, of a stabilizer selected from the group consisting of phenols, amines, quinones, copper salts of organic acids and addition compounds of copper-I halides and phosphites and
- b. 0.001 to 5% by weight, based on the weight of said ester, of a compound of the formula:
- ##STR3## wherein R.sup.1 is hydrogen, alkyl having 1 to 4 carbon atoms, chlorine or alkoxy having 1 to 4 carbon atoms, R.sup.2 is hydrogen or alkyl having 1 to 4 carbon atoms and R.sup.3 and R.sup.4 are each hydrogen, CH.sub.2 OH, CH.sub.2 --O--A, ##STR4## CHO, COOH, COO--A, CONH.sub.2, CONH--A, CONH--Ar, CH.sub.2 Cl, CH.sub.2 Br or CN wherein A is alkyl having 1 to 6 carbon atoms and Ar is aryl having 6 to 15 carbon atoms.
A process for preparing a stabilized acrylic acid ester of a polyhydric alcohol which comprises esterifying acrylic acid with a polyol capable of esterification in the presence of
- a. 0.01 to 0.3% by weight, based on the weight of acrylic acid and polyol, of a stabilizer selected from the group consisting of phenols, amines, quinones, copper salts of organic acids and addition compounds of copper-I halides and phosphites and
- b. 0.001 to 0.5% by weight, based on the weight of acrylic acid and polyol, of a compound of the formula:
- ##STR5## wherein R.sup.1 is hydrogen, alkyl having 1 to 4 carbon atoms, chlorine or alkoxy having 1 to 4 carbon atoms, R.sup.2 is hydrogen or alkyl having 1 to 4 carbon atoms and R.sup.3 and R.sup.4 are each hydrogen, CH.sub.2 OH, CH.sub.2 --O--A, ##STR6## CHO, COOH, COO--A, CONH.sub.2, CONH--A, CONH--Ar, CH.sub.2 Cl, CH.sub.2 Br or CN wherein A is alkyl having 1 to 6 carbon atoms and Ar is aryl having 6 to 15 carbon atoms.
Dependencies are inferred from the claim text.