JP2565714B2 - Resin composition with excellent compatibility - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a resin composition having excellent compatibility, which is obtained by mixing specific polycarbonate polymers having different molecular structures, and is used for molding materials in general. It

(Problems to be Solved by Conventional Techniques and Inventions) Aromatic polycarbonate resins are known to have excellent thermal properties, electrical properties, and mechanical properties, especially impact strength, but have a large molecular weight. As the melt viscosity increases, the molding conditions such as molding temperature and molding pressure need to be made relatively large, which not only has the drawback of inferior melt-molding processability, but also the aromatics currently widely used. The polycarbonate resin is a polycarbonate resin of 2,2-bis- (4-hydroxyphenyl) propane (bisphenol A), but its glass transition temperature is generally lower than 145 ° C if the viscosity average molecular weight v is 16,000 or more. Although it does not exist, it does not exceed 150 ° C even if the viscosity average molecular weight v becomes large, and the glass transition temperature is low among the amorphous resins (transparent resin). There is a point.

Conventionally, various improvements have been made to enhance the melt-molding processability of an aromatic polycarbonate resin. For example, as a branching agent, a phenol resin having two or more reactive hydroxy groups is present in an amount of 0.01 to 0.5 mol% to produce a polycarbonate resin, which enhances fluidity and improves melt moldability (Japanese Patent Laid-Open No. 2004-242242). 48-693) have been proposed. However, the use of the branching agent causes the resin to have a non-Newtonian flow, and even if the fluidity is enhanced, there is a disadvantage that the orientation of the molded product is nonuniform, which is particularly unsuitable for optical molded products.

Various improvements have also been made to increase the glass transition temperature of the aromatic polycarbonate resin. For example,
An attempt is made to increase the glass transition temperature by mixing with a polyether or polyester (see, for example, JP-A-52-5144).
5) It has been proposed. However, the resin composition obtained in this manner is generally opaque, and thus is unsuitable for optical molded articles and the like. On the other hand, in order to improve this opacity, it is attempted to increase the glass transition temperature by copolymerizing with polyether or polyester (for example,
Japanese Unexamined Patent Publication (Kokai) No. 62-156126) has been proposed, but it has the drawback that complicated polymerization must be carried out and the energy cost is high.

(Means to solve the problems) As a result of our hard work, we did not perform complicated polymerization,
Aromatic polycarbonate polymer obtained by carbonate-bonding 4 '-[1,4-phenylenebis (1-methylethylidene)] bisphenol and carbonate-bonded 4,4'-(1-phenylethylidene) bisphenol By finding a combination of aromatic polycarbonate polymers that are compatible by mixing with an aromatic polycarbonate polymer and improving the melt moldability, and because they are compatible, the melt moldability is improved and It became clear that the homogeneity was improved and a transparent resin composition was obtained, which led to the present invention.

(Structure of the Invention) The present invention relates to an aroma comprising a repeating unit represented by the following formula (A) obtained by carbonate-bonding 4,4 ′-[1,4-phenylenebis (1-methylethylidene)] bisphenol. Group 1-99% by weight polycarbonate polymer and 4,4 '
Aromatic polycarbonate polymer comprising a repeating unit represented by the following formula (B) obtained by carbonate-bonding -4,4 '-(1-phenylethylidene) bisphenol
The present invention relates to general molding materials made of a resin composition having an excellent compatibility of 99 to 1% by weight.

The viscosity average molecular weight of the aromatic polycarbonate polymer of the present invention is preferably from 13,000 to 50,000. If it is less than 13,000, the resin composition becomes brittle, and if it exceeds 50,000, the melt fluidity deteriorates and the moldability deteriorates. As a method for producing the aromatic polycarbonate polymer of the present invention, for example, 4,4 '-[1,4-
Phenylene bis (1-methylethylidene)] bisphenol or phosgene method in which 4,4 '-(1-phenylethylidene) bisphenol and phosgene are reacted by interfacial polycondensation, or 4,4'-[1,4-phenylenebis ( 1
-Methylethylidene)] bisphenol or 4,4'-
Examples thereof include a transesterification method in which (1-phenylethylidene) bisphenol and a carbonic acid ester such as diphenyl carbonate are reacted.

The method of mixing each aromatic polycarbonate polymer is a known method, for example, a method of kneading and granulating with an extruder or the like after mixing with a Henschel mixer, V-blender, ribbon blender, Banbury mixer, single-screw or multi-screw extrusion. A method of using after kneading by melting and kneading with a machine, a kneader, or the like can be adopted. The resin composition thus obtained may contain other additives, dyes, pigments, glass fibers, carbon black, carbon fibers, antistatic agents, weathering stabilizers, carbonates, and the like, as long as the object of the present invention is not impaired. An inorganic substance such as calcium may be added.

Hereinafter, although an example is given and explained, the present invention is not limited to these examples.

(Example) Example 1 200 parts by weight (20% by weight) of 4,4 '-[1,4-phenylenebis (1-methylethylidene)] bisphenol aromatic polycarbonate (A) and 4,4'-( 800 parts by weight (80% by weight) of aromatic polycarbonate (B) consisting of 1-phenylethylidene) bisphenol was mixed well with a Henschel mixer, fed to a 15 mmΦ extruder (set temperature 250 ° C.), and the residence time was 2.5 minutes while kneading. Extruded under the conditions.
The obtained aromatic polycarbonate polymer resin was colorless and transparent, and the glass transition temperature was Tg = 173 ° C. from DSC: (Differential Scanning Calorimeter). In addition, when the composition ratio of each is determined from the spectrum of ¹³ C-NMR: (carbon 13-NM), (A): (B) =
It was 1: 4. The DSC used for the measurement is Perkin-Elmer2C type,
^{As for 13} C-NMR, JEOL JNM-GX270 type was used.

Example 2 20 parts by weight (20% by weight) of each of (A) and (B) shown in Example 1 and 80 parts by weight (80% by weight) were charged in a glass kolben, 200 ml of methylene chloride was added, and the mixture was stirred at room temperature. After dissolving in a paste, the mixture was poured into methanol to obtain a white powder. The glass transition temperature of the obtained resin and the respective composition ratios were the same as in Example 1. When this white powder was molded into a 50 mm × 50 mm × 1 mm (length × width × thickness) sheet by a hot press quenching method, a colorless and transparent sheet was obtained.

Example 3 In the same manner as in Example 1, a mixture of (A) 500 parts by weight (50% by weight) and (B) 500 parts by weight (50% by weight) was extruded. The obtained aromatic polycarbonate polymer resin was colorless and transparent and had a glass transition temperature Tg of 165 ° C. The composition ratio of each component was (A) :( B) = 1: 1.

Example 4 In the same manner as in Example 2, (A) 50 parts by weight (50% by weight)
And (B) 50 parts by weight (50% by weight) were dissolved in methylene chloride, and methanol was poured to obtain a white powder. The glass transition temperature and composition ratio of the obtained resin were the same as in Example 3.
The press sheet was colorless and transparent.

Example 5 A mixture of (A) 800 parts by weight (80% by weight) and (B) 200 parts by weight (20% by weight) was extruded in the same manner as in Example 1. The obtained aromatic polycarbonate polymer resin was colorless and transparent and had a glass transition temperature Tg of 157 ° C. The composition ratio of each was (A) :( B) = 4: 1.

Example 6 In the same manner as in Example 2, (A) 80 parts by weight (80% by weight)
And (B) 20 parts by weight (20% by weight) were dissolved in methylene chloride, and methanol was poured to obtain a white powder. The glass transition temperature and composition ratio of the obtained resin were the same as in Example 5.
The press sheet was colorless and transparent.

Comparative Example In the same manner as in Example 1, (A) an aromatic polycarbonate polymer comprising 800 parts by weight (80% by weight) and 4,4 '-[1,3-phenylenebis (1-methylethylidene)] bisphenol ( C) 200 parts by weight (20% by weight) of the mixture were extruded. The obtained aromatic polycarbonate polymer resin was white, and the transition temperatures were Tg = 102 ° C and 152 ° C. Also,
The composition ratio was (A) :( C) = 4: 1.

(Effects of the Invention) Molded articles obtained by melt molding using the aromatic polycarbonate resin compositions having excellent compatibility obtained in Examples 1 to 6 have a glass transition temperature of 1 and non-uniform molecular orientation. It was transparent without showing any sex. Therefore, it is useful in the field of molding and processing of engineering plastics, building materials, automobile parts, optical materials, optical disks, electric parts, etc., which require transparency.

Claims (1)

(57) [Claims] 1. An aromatic polycarbonate polymer having a repeating unit represented by the following formula (A) obtained by carbonate-bonding 4,4 '-[1,4-phenylenebis (1-methylethylidene)] bisphenol. Combined 1-99% by weight and 4,4 '
A resin composition having excellent compatibility, which comprises 99 to 1% by weight of an aromatic polycarbonate polymer having a repeating unit represented by the following formula (B) obtained by carbonate-bonding (1-phenylethylidene) bisphenol.