JPH0651840B2 - Polycarbonate resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a polycarbonate resin composition having improved light resistance, and more specifically, to a light resistance by containing a specific methylenebis (benzotriazolylphenol) compound. And a remarkably improved polycarbonate resin composition.

[Problems to be Solved by Prior Art and Invention]

Polycarbonate resin is widely used in, for example, automobile parts, various precision machine parts, and the like because it has high strength and rigidity and excellent abrasion resistance.

However, the polycarbonate resin does not have sufficient light resistance, and for example, in the outdoor use or the indoor use under the irradiation of a fluorescent lamp, the use of the polycarbonate resin is significantly limited due to the discoloration of the product or the decrease in strength.

For this reason, various light stabilizers have been conventionally used singly or in combination of several kinds, and in particular, a benzotriazole type ultraviolet absorber is generally used because its effect is relatively large, but the result is not yet obtained. It was inadequate and needed further improvement.

[Means for solving problems]

The present inventors have conducted extensive studies in view of the present situation, and as a result, the methylenebis (benzotriazolylphenol) compound represented by the following general formula (I) stabilizes the polycarbonate resin for a long period of time. I found that I can do it.

That is, the present invention is based on 100 parts by weight of a polycarbonate resin containing substantially no hindered amine light stabilizer,
The present invention provides a polycarbonate resin composition containing 0.001 to 5 parts by weight of a compound represented by the following general formula (I) and having improved light resistance.

The addition amount of the compound represented by the general formula (I) is 0.001 to 5 parts by weight based on 100 parts by weight of the polycarbonate resin,
It is preferably 0.01 to 3 parts by weight.

The polycarbonate resin stabilized in the present invention is a polymer carbonate of bisphenol.

Examples of the bisphenol used include bis (4-
Hydroxyphenyl) methane, 2,2-bis (4-hydroxyphenyl) bropan (hereinafter referred to as bisphenol-A), 2,2-bis (4-hydroxy-3-methylphenyl) propane, 4,4-bis (4- Hydroxyphenyl) heptane,
Bisphenols such as 2,2-bis (4-hydroxy-3,5-dichlorophenyl) propane, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane; bis (4-hydroxyphenyl) ether Dihydric phenol ethers such as bis (3,5-dichloro-4-hydroxyphenyl) ether; p, p'-dihydroxydiphenyl, 3,3'-dichloro-4,4'-dihydroxydiphenyl and the like Dihydroxydiphenyl; bis (4-hydroxyphenyl) sulfone, bis (3,5-dimethyl-4-hydroxyphenyl)
Dihydroxyaryl sulfones such as sulfones; 1,
Dihydroxybenzene such as 4-dihydroxy-2,5-dichlorobenzene and 1,4-dihydroxy-3-methylbenzene;
Resorcinol, hydroquinone, halo- and alkyl-substituted dihydroxybenzenes, as well as bis (4-hydroxyphenyl) sulfoxide, bis (3,5-dibromo-4--
Dihydroxydiphenyl sulfoxide such as hydroxyphenyl) sulfoxide and the like. Various bisphenols other than those mentioned above are also used to obtain the carbonate polymer. In addition, mixtures of the above materials can be used to prepare the aromatic carbonate polymers of this invention.

The aromatic carbonate polymer used in the practice of the present invention is prepared by reacting a dihydric phenol with a carbonate precursor. As the carbonate precursor, carbonyl halide, carbonate ester or haloformate is used. Examples of the carbonyl halide used in the present invention include carbonyl bromide, carbonyl chloride and a mixture thereof. Examples of the carbonate ester used in the present invention include diphenyl carbonate, di (chlorophenyl) carbonate, di (tolyl carbonate, dinaphthyl carbonate, and a mixture thereof. Examples of the haloformate used in the present invention include hydroquinone bis. Examples thereof include dihydric phenol haloformates such as chloroformates and glycol haloformates such as ethylene glycol haloformates.

Of these, carbonyl chloride, known as phosgene, is particularly suitable.

The aromatic carbonate polymers of the present invention are prepared with a molecular weight regulator and an acid acceptor.

The molecular weight modifier used in carrying out the present invention is phenol, cyclohexanol, methanol, p-tert-butylphenol, p-bromophenol, etc., preferably p-
Tertiary butylphenol is used.

The acid acceptor includes an organic or inorganic acid acceptor,
Examples of the organic acid acceptor include pyridine, triethylamine, dimethylaniline and the like, and examples of the inorganic acid acceptor include an alkali or alkaline earth metal hydroxide,
Either carbonates, bicarbonates or phosphates are used.

Known heat stabilizers, antioxidants and the like can be appropriately added to the composition of the present invention, and phenolic antioxidants are particularly preferable because of their large effects.

Examples of phenolic antioxidants include 2,6-di-
Tert-Butyl-p-cresol, 2,6-diphenyl-4-octadecyloxyphenol, stearyl-β- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, distearyl-3,5- Di-tert-butyl-4-hydroxybenzylphosphonate, thiodiethylenebis [β- (3,5-di-tert-butyl-
4-hydroxyphenyl) propionate], hexamethylenebis [β- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 4,4′-thiobis (6-tert-butyl-
m-cresol), 2-octylthio-4,6-bis (3,5-di-tert-butyl-4-hydroxyphenoxy) -s-triazine, 2,
2'-methylenebis (4-methyl-6-tert-butylphenol), 2,2'-methylenebis (4-ethyl-6-tert-butylphenol), bis [3,3-bis (4-hydroxy-3-tertiary) (Butylphenyl) butyric acid] glycol ester,
4,4'-butylidene bis (6-tert-butyl-m-cresol),
2,2'-Ethylidene bis (4,6-di-tert-butylphenol)
, 2,2'-Ethylidene bis (4-tert-butyl-6-tert-butylphenol), 3,6-dioxaoctylene bis [β- (3-methyl-5-tert-butyl-4-hydroxyphenyl) Propionate], 1,1,3-tris (2-methyl-5-tert-butyl-4-hydroxyphenyl) butane, bis [2-tert-butyl-4-methyl-6- (2-hydroxy-3-sec) 3-butyl-5-methylbenzyl)
Phenyl] terephthalate, 1,3,5-tris (2,6-dimethyl-3-hydroxy-4-tert-butylbenzyl) isocyanurate, 1,3,5-tris (3,5-di-tert-butyl- 4-hydroxybenzyl) isocyanurate, 1,3,5-tris (3,5-di-tert-butyl-4-hydroxybenzyl) -2,4,6-trimethylbenzene, 1,3,5-tris [β -(3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxyethyl] isocyanurate, tetrakis [methylene-β- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] methane, etc. Can be given.

The amount of these phenolic antioxidants added is 0.001 to 3 parts by weight, preferably 0.005 to 1 part by weight, based on 100 parts by weight of the polycarbonate resin.

In addition, an organic phosphite compound, a filler, a pigment, an antistatic agent, etc. can be added to the composition of the present invention, if necessary.

Hereinafter, the present invention will be described in more detail with reference to Examples.

Example 1 0.30% by weight of a sample compound was added to bisphenol A polycarbonate powder having an intrinsic viscosity of 0.57 (in dioxane, 30 ° C.) and extruded at 260 ° C. to form pellets. This pellet was injection-molded at 320 ° C to prepare a test piece having a thickness of 2.5 mm.

Using this test piece, irradiate ultraviolet rays with a high pressure mercury lamp,
According to ASTM D1925, the yellowness of the unirradiated test piece and the test piece after 2 weeks of irradiation were measured and the change (ΔYI)
I asked.

The results are shown in Table-1.

Example 2 The same procedure as in Example 1 was repeated except that 0.10% by weight of stearyl-β- (3,5-ditert-butyl-4-hydroxyphenyl) propionate was added to the mixture.

The results are shown in Table-2.

Claims (1)

[Claims] 1. A light-resistant material comprising 0.001 to 5 parts by weight of a compound represented by the following general formula (I) based on 100 parts by weight of a polycarbonate resin containing substantially no hindered amine light stabilizer. A polycarbonate resin composition having improved properties.