CS202829B1 - Process for preparing photodegradative polymers - Google Patents

Description

Czechoslovakia SOCIALIST REPUBLIC (19) DESCRIPTION FOLLOWING COPYRIGHT CERTIFICATE 202829 (11) (Bl) (51) Int. Cl.3 C 08 F 18/36 (22) Entries 29 11 78 (21) (PV 7819-78) DISCUSSION ORDER (40) Published 30 05 80 (45) Published 15 03 82 A DISCOVERIES (75,)

The inventor

LUKÁČ IVAN ing. CSc., BRATISLAVA, CHMELA ŠTEFAN prom. chem., NITRA, ZVARA IVAN ing, BRATISLAVA and HRDLOVIC PAVOL RNDr. CSc, MALACKY (54) Preparation of photodegradative polymers

BACKGROUND OF THE INVENTION The present invention relates to a process for preparing photodegradable polymers obtained by polymerizing p-cyclopentyl acrylophenone (I).

CH 3 -CH alone, or by copolymerizing it with wool-like monomers.

Polymers containing β-cyclopentylacrylphenone structural units over unsubstituted (NSR Patent No. 2 119 855) and also oprotipmethoxyacrylophenone structural units (Czechoslovak Patent No. 170397) have the more quantum yields of tearing of the mains. In contrast to derivatives of the chalcone type, in which only copolymers with styrene (No. AO 185365) are protected, their advantage is the more universal use for the preparation of copolymers with nivinyl monomers.

SUMMARY OF THE INVENTION The object of the present invention is to provide photogradative polymers obtained by polymerizing p-cyclopentyl acryrylphenone alone or by polymerization with vinyl monomers, preferably with styrene, methyl acrylate, acrylenitrile, acrylic acid, methacrylic acid, methyl methacrylate, ethylene, vinyl chloride or vinyl acetate. wherein the polymerization mixture comprises 1 to 100 wt. % p-cyclopentylacrylophenone. The prepared polymers are characterized by! in that the exposed influences diminish substantially faster than conventionally used polymers. The nature of the action of carbonyl structures lies in the increased sorption! and also that the quantum extraction of the main polymer bonds, which at least 366 mm in the benzene solution of the invention, are at least 3 orders of magnitude in the commercial polymers such as polystyrene and polymethyl methacrylate.

The following examples illustrate the invention: Example 1

Poly-p-cyclopentyl acrylophenone. 7.6 g of p-cyclopentylacrylophenone was polymerized with 4 mg of AIBN while bubbling with purified nitrogen and a pressure of 1.6 kPa for 1 hour. The polymer was purified by 3 times precipitation in benzene to methanol. Yield 3.9 g (51%). The polymer had M '= 108,000 and Mn = 260,000 determined from GPC measurement and the quantum yield of the main bond tearing at 366 nm in the benzene solution was 0.30 ± 0.05.

Copolymer of p-cyclopentylacrylophenone with styrene.

3.07 g of p-cyclopentylacrylophenone and 13.6 g of styrene were polymerized without initiator at 80 ° C 202829

Claims (3)

202829 2 hours in a sealed ampoule under nitrogen. The yield of 3 times the precipitated polymer from benzene-methanol was 4.7 g (28%). The polymer had M = 00030,000 as determined by scattering and contained 39% carbonyl structural units. The quartz yield of the main binders at 366 nm in the benzene solution was 0.1 ± 0.03. Similarly, a polymer was prepared wherein the polymer blend contained 1 g of p-cyclopentylacrylphenone and 99 g of styrene. In this case, the quantum yield of the tear of the main bindings was less severe. Example 3 Copolymer of p-cyclopentylacrylophenone with methyl methacrylate (MMA) OBJECTIVE Preparation of photodegradative polymers, characterized in that β-cyclopentylacrylphenone is polymerized alone or with vinyl monomer such as styrene, methyl acrylate acrylonitrile, acrylic acid, meta acid 3.1 g of cyclopentylacrylphenone and 14.25 g of MMA were polymerized without initiator at 80 ° C for 24 hours in a sealed ampoule under nitrogen. The yield of 3 times the precipitated polymer from benzene to methanol was 2.77 g (16%). The polymer had M = 15 x 10 6 determined by vlosozimetric and contained 36% carbonyl component. The quantum yield of the main bond shaking at 366 nm in the benzene solution was 0.1 ± 0.03. The prepared polymeric materials can be used for the preparation of packaging materials with a controllable lifetime in daylight, or for other purposes in which light degradation or photosensitivity is required. Wherein the polymerization mixture contains from 1 to 100% by weight of the composition. p-cyclopentylarylphenone. vet 31 81. 5112 Price: 2,40 Kčs