Abstract The invention relates to a process for the controlled hardening of unsaturated polyester resins at temperatures of -5° C. to +150° C. using an organic peroxide initiator. According to the process of the invention an organic dyestuff of the general formula (I), ##STR1## wherein R 1 stands for a group of the general formula (II), ##STR2## and in this formula R 5 is a C 1-4 alkyl group and n is an integer from 1 to 3, R 2 and R 3 each represent a C 1-4 alkyl group, R 4 stands for hydrogen, or R 1 and R 4 form together a group of the general formula (III), ##STR3## and in this formula R 6 , R 7 and R 8 each represent hydrogen or a C 1-4 alkyl group and Z stands for oxygen or sulfur atom or a -NH- group, and X stands for chlorine or bromine, is admixed with the polyester resin and/or the organic peroxide in an amount of 0.001 to 0.05% by weight, calculated for the weight of the polyester resin. Using the method of the invention the composition and homogeneity of the polyester resin/additive mixtures can be observed easily and the progress of cross-linking can be monitored visually through characteristic colors and color changes, respectively.
Inventors
👤 Istvan Kovacsay
👤 Maria Szajko nee Lorinczi
👤 Istvan Dubovszky
👤 Laszlo Magdanyi
👤 Ferenc Szailer
👤 Ede Szatmari
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-03 16:33
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/29
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
162 words
A process for the controlled hardening of unsaturated polyester resins at temperatures of -5° C. to +150° C. using an organic peroxide initiator optionally along with an accelerator and/or promotor, characterized in that an organic dyestuff of the formula ##STR8## wherein R 1 stands for a group of the formula ##STR9## and in this formula R 5 is C 1-4 alkyl and n is an integer from 1 to 3, R 2 and R 3 each represent C 1-4 alkyl, R 4 stands for hydrogen, or R 1 and R 4 form together a group of the formula ##STR10## and in this formula R 6 , R 7 and R 8 each represent hydrogen or C 1-4 alkyl and Z stands for oxygen or sulfur or --NH--, and X stands for chlorine or bromine, is admixed with a said polyester resin and/or said organic peroxide in an amount of 0.001 to 0.05% by weight, calculated on the weight of the polyester resin.
Claim 2
Dependent Claim
162 words
A process for the controlled hardening of unsaturated polyester resins at temperatures of -5° C. to +150° C. using an organic peroxide initiator optionally along with an accelerator and/or promotor, characterized in that an organic dyestuff of the formula ##STR8## wherein R 1 stands for a group of the formula ##STR9## and in this formula R 5 is C 1-4 alkyl and n is an integer from 1 to 3, R 2 and R 3 each represent C 1-4 alkyl, R 4 stands for hydrogen, or R 1 and R 4 form together a group of the formula ##STR10## and in this formula R 6 , R 7 and R 8 each represent hydrogen or C 1-4 alkyl and Z stands for oxygen or sulfur or --NH--, and X stands for chlorine or bromine, is admixed with a said polyester resin and/or said organic peroxide in an amount of 0.001 to 0.05% by weight, calculated on the weight of the polyester resin.
Claim 3
Dependent Claim
36 words
A process as claimed in claim 1, characterized in that the organic dyestuff of the formula (I) is used in an amount of 0.01 to 0.03% by weight calculated on the weight of the polyester resin.
Claim 4
Dependent Claim
30 words
A process as claimed in claim 1 or 2, characterized in that methylene blue, toluylene blue, brillantcresyl blue or neutral red is as as organic dyestuff of the formula (I).
Claim 5
Dependent Claim
12 words
A hardened polyester resin prepared according to the method of claim 1.