JPS60156750A - Polycarbonate resin composition - Google Patents

Abstract

PURPOSE:The titled composition having extremely improved fluidity during molding and solvent resistance without damaging mechanical properties of resin of its own, obtained by blending polycarbonate with polyvinyl acetal. CONSTITUTION:35-99wt%, preferably 50-97wt% polycarbonate resin is blended with 65-1wt%, preferably 3-50wt% polyvinyl acetal. A polycarbonate obtained from a dihydric phenol and 2,2-bis(4-hydroxyphenyl)propane(bisphenol A), having 20,000-40,000 viscosity average molecular weight is preferable as the polycarbonate. A polyvinyl formal having 100-1,000, preferably 150-800 polymerization degree and >=70mol%, preferably 78-90mol% formalization degree is used as the polyvinyl acetal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a polycarbonate resin composition that has excellent fluidity during molding and chemical resistance without impairing the mechanical properties inherent to the polycarbonate resin.

[Technical background of the invention and its problems]

Polycarbonate resin is used in a wide range of fields as a so-called engineering plastic because its molded products have excellent mechanical properties and heat resistance.

However, this resin has the drawbacks of poor fluidity during molding and chemical resistance due to its high melt viscosity.

In order to improve this point, various methods have been proposed in the past, but none of these methods has improved fluidity without impairing the excellent mechanical properties and heat resistance inherent to polycarbonate resin.

It was not satisfactory in terms of improving chemical resistance.

[Purpose of the invention]

The object of the present invention is to provide a polycarbonate resin composition that has extremely high fluidity, that is, extremely good moldability and excellent chemical resistance, without deteriorating the excellent properties of polycarbonate resin.

[Summary of invention]

As a result of extensive research to achieve the above object, the present inventors have found that the above object can be achieved by blending a predetermined amount of polyvinyl acetal, which will be described later, into a polycarbonate resin, and the polycarbonate resin composition of the present invention has been developed. I came to develop something. That is, the polycarbonate resin composition of the present invention has a border symbol □'' consisting of 35 to 99 weight of poly□ carbonate resin and 65 to 1 weight of polyvinyl acetal.

The polycarbonate resin that serves as the pace of the composition of the present invention is produced by a solvent method, that is, a carbonate precursor of dihydric phenol and phosgene in a solvent such as methylene chloride in the presence of a known acid acceptor and a molecular weight regulator. or resins produced by transesterification of dihydric phenol and diphenyl carbonate with a carbonate precursor. □ Here, as the dihydric phenol that can be used, ' □ Bisphenols are preferable, and 2,2-bis(4-hydroxyphenyl)furopane (bisphenol A) is particularly preferable. Alternatively, part or all of bisphenol A may be fHlled with other dihydric phenol. Examples of dihydric phenols other than bisphenol hl include hydroquinone, 4,4'-dihydroxydiphenyl, bis(4-
hydroxyphenyl)alkane, bis(4-hydroxyphenyl)cycloalkane, bis(4-hydroxyphenyl)sulfite, bis(4-hydroxyphenyl)sulfone, bis(4-hydroxyphenyl) sulfoxide, bis(4-hydroxyphenyl)sulfoxide Mention may be made, for example, of compounds such as ethers or halogenated bisphenols such as bis(3,5-dibromo-4-hydroxyphenyl)propane. A homopolymer, a copolymer or a blend of two or more of these dihydric phenols may be used. Furthermore, it may be a thermoplastic, plastic "y7/,"-branched poly, or "-bonate" made by reacting a polyfunctional aromatic compound with a dihydric phenol and/or a carbonate precursor.

The polycarbonate resin used has a viscosity average molecular weight of 1o, ooo to 1 from the viewpoint of mechanical strength and moldability.
00,000 is preferable, especially 20,000
~40,000 is preferred.

The resin composition of the present invention is constructed by blending 1 to 65% by weight of polyvinyl acetal with the above-mentioned polycarbonate resin.

When the amount of polyvinyl acetal blended is less than 1% by weight (the carbonate resin is more than 99% by weight), the resulting resin composition has poor fluidity.

It is insufficient in terms of improvement effect on chemical resistance, and
If the blended amount of polyvinyl acetal exceeds 65% (polycarbonate resin is less than 3.5% by weight), the heat resistance of the resin composition will decrease.
Unsuitable/unsuitable. The total amount of polyvinylated tar is 3'3~
It is preferable that it is 50% by weight (yN IJ force kneebonate resin compounding amount is 5'θ~97fi''amount''%).

“　:1:□　□.

The polyvinyl acetal used is produced by reacting polyvinyl alcohol with 'naldehyde' in the presence of an acid catalyst such as hydrochloric acid or sulfuric acid and then condensing it. Everything is acetalized and the length is □:
′□. The production method is a two-step method in which, for example, when polyvinyl acetate is hydrolyzed and decomposed with an acid, an aldehyde is added in the initial stage of the process, and the hydrolysis and acetalization proceed simultaneously; or the polyvinyl alcohol is separated once. There is a two-step method in which this is later converted into acetal.

Polyvinyl acemyl porcelain; □Those suitable for use in the present invention have a degree of polymerization of 100 to 1000, preferably 156 to 1000.
800+: system lumalization degree 70 or more, preferably 1
Thickness 7″ 8-90 mole polyvinyl thread 1 marl;
□Or 1 degree of polymerization 200-2500, preferably 300
~ 2,000, butylated polyvinyl petyranyl with a concentration of 50 mol S or more, preferably 60 to 80 mol S'. After blending using a shell mixer, Suhar mixer, etc., the resulting mixture is blended using a Banbury mixer □-1 single-shaft kneader 1, etc. ：Te2゛50~300t：'Temperature□℃'
It is possible to melt and knead the material and make it into a mass of "m1".

At this time, if necessary, additives such as non-filling i1 □ colorant, □ Part 1 Sendai type □, or other synthetic resins, elastomers, etc. may be added in the following manner. It can also be blended.

Inorganic fillers added for the purpose of increasing the mechanical strength, durability, or weight of polycarbonate resin include glass fiber, glass peas, glass flakes, calcium carbonate,
Examples include calcium sulfate, talc, clay, and mica. In particular, the glass filler with 6 glazes is for 1. These fillers may be blended in an amount of 1 to 5 parts by weight per 100 parts by weight of the polycarbonate resin. The amount is 50
If the amount exceeds parts by weight, the fluidity of the resulting resin composition will be extremely reduced.

The colorant is a pigment or dye for imparting color to the polycarbonate resin, and the pigment is an organic pigment such as phthalocyanine, ginacridone, or benzidine;
oxides of metals such as titanium, lead, zinc, cadmium,
Examples include inorganic pigments such as sulfides, sulfates, carbon black produced by a furnace method or an impact method, and aniline black. Examples of dyes include azo, anthraquinone, thioindigo, quinoline, and indanthrene dyes. The blending amount of these colorants is 0.00 parts by weight per 100 parts by weight of polycarbonate resin.
It is 5 to 5.0 parts by weight. If the blending amount exceeds 5.0 parts by weight, the impact resistance of the resulting resin composition will decrease.

Other additives include, for example, phosphite esters,
Phosphoric acid ester-based antioxidants; e.g. benzotriazole-based and benzophenone-based ultraviolet absorbers; e.g. aliphatic carboxylic acid ester-based and paraffin-based external lubricants; commonly used flame retardants, mold release agents, antistatic agents, etc. can be given.

Examples of other synthetic resins include polyethylene, polypropylene, polystyrene, AS resin, JJiXABS resin, polyester, and polymethyl methacrylate. In addition, as an elastomer, II
R, SBR, F2PR.

Examples include acrylic elastomers.

[Embodiments of the invention]

Examples 1 to 10 As a polycarbonate resin, A: viscosity average molecular weight 22
, 500 bisphenol A polycarbonate resin,
B: Bisphenol A with a viscosity average molecular weight of 29,000
A mold polycarbonate resin was prepared.

As polyvinyl acetal, A: degree of polymerization 350, formal (180 molti polyvinyl formal, B: 3
Polyvinyl butyral having an M degree of 1000 and a butylation degree of 70 moles was prepared.

These components were mixed in the proportions shown in the table, kneaded, and subjected to injection molding. The fluidity, that is, moldability, chemical resistance, and heat distortion temperature of each resin composition was measured according to the following specifications.

Fluidity: Minimum filling pressure gauge pressure (kg
/cm2). Materials with high values have high fluidity.

however, The actual pressure is 11 times the gauge pressure. Ta.

Chemical resistance: Nakatsuji et al., Color Materials, vol. 39, p. 455 (196
The critical strain is expressed by the 1/4 ellipse method described in 1996). The chemical solution used at that time: Red Apollo gasoline manufactured by Idemitsu Kosan Co., Ltd.

Heat distortion temperature: Measured according to the method specified by ASTM D648.

The above results are summarized in the table.

〔Effect of the invention〕

As is clear from the above results, the polycarbonate resin composition of the present invention has excellent fluidity during molding, and the molded products obtained also maintain the mechanical properties and heat resistance that polycarbonate resin originally has. Home appliances 1.
For injection molding for manufacturing optical equipment, automobile parts, etc.
・It is useful as a material for injection compression molding, and its industrial value is great. □ Furthermore, the resin composition of the present invention has excellent properties such as colorability, paintability, and plating performance.

Claims (1)

[Claims] A polycarbonate resin composition comprising 35 to 99% by weight of polycarbonate resin and 65 to 1% by weight of polyvinyl acetal.