JPH0699632B2 - Method for reducing melt viscosity of polyethersulfone resin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for reducing the melt viscosity of a polyethersulfone resin, that is, by introducing a copolymer of a vinyl aromatic monomer and a maleimide monomer into the polyethersulfone resin. It relates to a method for reducing the melt viscosity of a sulfone resin. More specifically, in molding a polyether sulfone resin, 2.5 to 2.5 of a copolymer containing a repeating unit of a vinyl aromatic monomer and a repeating unit of a maleimide monomer.
Provided is a method of reducing the melt viscosity of a polyethersulfone resin by mixing 5 parts by weight with 100 parts by weight of the polyethersulfone resin without deteriorating the physical properties of the molded product.

Any suitable polyethersulfone resin can be used in the practice of the present invention. Suitable polyether sulfone resins include poly (diphenyl ether sulfone), poly (diphenyl sulfone-diphenyl ether sulfone) copolymers and poly (diphenyl sulfone-bisphenol A) copolymers, which are preferred polyether sulfones. Is included).

Poly (diphenyl sulfone-bisphenol A) copolymers are commercially available from Union Carbide Corporation and are available from Udel® P-1700 (Ude1 P-17).
00) It is named polysulfone resin.

U.S. Pat.Nos. 4,108,834, 4,275,186 and 4,410,834 describing the preparation of various polyarylene polyether resins including polyether sulfones and their derivatives.
No. 307,222 is incorporated herein by reference.

Preferably vinyl aromatics / used in the present invention
The maleimide copolymer will contain about 50 to about 60 mole% of the repeating unit of vinyl aromatic monomer and about 50 to about 40 mole% of the repeating unit of maleimide monomer. Vinyl aromatic / maleimide copolymer is 50,000 to 500,000, most preferably 50,
It should have a peak molecular weight of 000 to 150,000.

Vinyl aromatic monomers include styrene, p-methylstyrene, vinyltoluene, t-butylstyrene, α-methylstyrene, monobromostyrene, dibromostyrene, tribromostyrene, monochlorostyrene, dichlorostyrene, trichlorostyrene, dimethylstyrene. Etc. and mixtures thereof. The most preferred vinyl aromatic monomer is styrene.

Maleimide monomers include maleimide, N-methylmaleimide, N-ethylmaleimide, N-propylmaleimide,
N-butylmaleimide, N-phenylmaleimide, N-
(Tolyl) maleimide, N- (2,5-dimethyl) maleimide, N- (2,6-dimethyl) maleimide, N- (2-
Chlorophenyl) maleimide, N- (3-chlorophenyl) maleimide, N- (4-chlorophenyl) maleimide, N- (2,3-dichlorophenyl) maleimide, N-
(2,4-dichlorophenyl) maleimide, N- (2,6-dichlorophenyl) maleimide, N- (2-bromophenyl) maleimide, N- (3-bromophenyl) maleimide, N- (2,3-dibromo) Phenyl) maleimide, N-
It may be (2,4-dibromophenyl) maleimide, N- (2,5-dibromophenyl) maleimide, tribromophenylmaleimide and the like and mixtures thereof. The most preferred maleimide is N-phenylmaleimide.

The vinyl aromatic / maleimide copolymer can be made by the bulk method, continuous bulk method, solution method or suspension method. The preferred manufacturing method is the suspension method.

The moldable polyblend of the present invention comprises a spreading agent, a filler,
Processing aids, pigments, mold release agents and the like can be included for their conventionally used purposes. Also reinforcing fillers such as glass flakes and chopped glass fibers can be introduced.

The following example serves to illustrate the invention.

Example 1 This example serves to demonstrate the preparation of a styrene / N-phenylmaleimide copolymer suitable for use in the present invention by the suspension method.

About 140 grams of water, 37.6 grams of styrene, 62.4 grams of N-phenylmaleimide, 0.57 grams of t-butyl peroctoate, 0.32 grams of t-butyl perbenzoate, 0.002 grams of sodium bisulfite and 1.8 grams. Tricalcium phosphate was added to a citrate bottle. The bottle was capped and placed in an oil bath with constant stirring.
The bottle was heated to 95 ° C for 1.0 hour and then 140 ° C for 3.5 hours.
The beads formed were filtered, acidified to pH = 1.0 and washed with water. Total weight of beads collected is 99.2
Grams (99.2% conversion).

The copolymer was analyzed and found to contain 5.1% N, corresponding to 63.02 wt% N-phenylmaleimide (50 mol%). The copolymer was tested and found by differential scanning calorimetry to exhibit a glass transition temperature of 223 ° C. The copolymer has a peak molecular weight of 188,000, 298,000
Weight average molecular weight (Mw) and 129,600 number average molecular weight (Mw
n).

Examples 2-4 The following examples show the preparation of a control and two moldable polyblends of the invention.

Udel P-1700 Polysulfone resin (Union Carbide Corporation)
Was melt compounded at 320 ° C. with the styrene / N-phenylmaleimide copolymer prepared in Example 1. Test samples of various shapes were molded at 320 ° C and evaluated for physical properties and melt rheology. The compositions of the polyblends, their physical properties and melt rheological data are shown in Table 1 below.

The data in Table 1 shows that the copolymer of vinyl aromatic monomer and maleimide monomer has substantially no melt viscosity of polyethersulfone resin without any detrimental effect on physical properties during molding. Useful for showing reductions.

It will be apparent from the above description that various modifications can be made to the invention. However, such modifications are considered to be within the scope of the invention.

Claims (6)

[Claims] 1. When molding a polyether sulfone resin,
By mixing 2.5 to 5 parts by weight of a copolymer containing a repeating unit of a vinyl aromatic monomer and a repeating unit of a maleimide monomer with 100 parts by weight of a polyethersulfone resin, the physical properties of a molded article can be improved. Of decreasing the melt viscosity of polyethersulfone resin without deteriorating the various properties. 2. The method according to claim 1, wherein the maleimide monomer is an N-substituted maleimide monomer. 3. The method according to claim 1, wherein the maleimide monomer is N-phenylmaleimide. 4. The method according to claim 1, wherein the copolymer is styrene / N-phenylmaleimide. 5. The group in which the polyether sulfone resin comprises poly (diphenyl ether) sulfone, poly (diphenyl sulfone-diphenyl ether sulfone) copolymer and poly (diphenyl sulfone-bisphenol A) copolymer. A method according to claim 1 selected from: 6. The method according to claim 1, wherein the copolymer has a peak molecular weight of 50,000 to 500,000.