Modified styrene-maleic acid copolymer and use thereof
a technology of styrene-maleic acid and copolymer, which is applied in the field of modified styrene-maleic acid copolymer, can solve the problems of unreusable recovered decomposition product, and achieve the effect of low profile and low profil
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[0083]The present invention will be described in more detail below by way of Examples thereof. The evaluation methods for the properties of the resins used in Examples will be described below.
(Modification Rate)
[0084]The modification rate of the carboxylic acid group was calculated from the peak (1610 to 1550 cm−1) strength of carboxylate and the peak (1770 to 1720 cm−1) strength of ester generated after the reaction, which were measured by an infrared spectroscopic analysis.
[0085]The shrinkage rate was determined by measuring a dimensional change after the unsaturated polyester resin composition was poured into a mold (100 mm×100 mm) and cured.
[0086]The cured molded article was immersed in a hot water at 100° C. for 5 hours (hot water reflux extraction). The reaction rate was calculated from the amount of an unreacted material extracted with a hot water, which was represented as “hot water extraction”.
(Flexural Modulus and Flexural Strength)
[0087]The ...
example a
Example A1
[0092]An unsaturated polyester varnish (solvent free) having a weight-average molecular weight of 4000 to 5000 was synthesized by the condensation polymerization of propylene glycol as a glycol with maleic anhydride as an unsaturated dibasic acid in equimolar amounts. Then, the resultant unsaturated polyester, styrene, methyl ethyl ketone peroxide as a radical initiator, and calcium carbonate as an inorganic filler were mixed in a weight ratio of the unsaturated polyester:styrene:methyl ethyl ketone peroxide:calcium carbonate=1:1:0.02:2, and the mixture was cured. The cured product was used as an unsaturated polyester resin to be decomposed and recovered.
[0093]Next, the cured product (3 g) of the unsaturated polyester resin, purified water (15 g), and KOH (0.84 g) were charged into a reaction tube, and the internal atmosphere of the reaction tube was replaced with an argon gas. Then, this reaction tube was tightly-sealed and immersed in a constant temperature bath at a tem...
example a2
[0096]A modified styrene-maleic acid copolymer containing maleic acid structure moieties into which groups having no unsaturated groups were incorporated was obtained as a white powder (19 g; modification rate 83 mol %) in the same manner as in Example A1, except that 1,3-dichloro-2-propanol (10 g) was mixed as a halogen and / or epoxy compound instead of epichlorohydrin (7 g), and the reaction was carried out at 80° C. for 5 hours. After that, an unsaturated polyester resin composition was prepared by using this modified styrene-maleic acid copolymer in the same manner as in Example A1.
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