JP2928826B2 - Heat resistant copolymer - Google Patents

Description

The present invention relates to a transparent heat-resistant resin. The resin according to the present invention is excellent in transparency, mechanical strength and heat resistance,
It can be used in a wide range of fields such as molded products and films.

(Prior Art) Conventionally, as a transparent resin, a methacrylic resin containing methyl methacrylate as a main component is known and used for a wide range of applications. However, methacrylic resins are limited in application because of low heat distortion temperature.

Since maleimide copolymers have high heat resistance, various studies have been made.

For example, a method of copolymerizing the above methyl methacrylate with an N-aromatic substituted maleimide is disclosed in JP-B-43-9753, JP-A-61-141715, JP-A-61-171708 and JP-A-61-171708. Japanese Unexamined Patent Publication No. 62-109811 discloses a method of copolymerizing an N-aromatic substituted maleimide with a styrenic resin, which is disclosed in JP-A-47-6891, JP-A-61-76512 and No. 61-276807. However, the resins obtained by these methods have better heat resistance as the N-aromatic substituted maleimide content increases, but have problems such as brittleness, poor workability, and coloring.

(Problem to be Solved by the Invention) An object of the present invention is to provide a resin having excellent transparency, heat resistance and mechanical strength.

(Means for Solving the Problems) In view of this problem, the present inventors have conducted intensive studies, and as a result, found that the constituent component (I), the constituent component (II), and the constituent component (II) in the main chain.
A transparent heat-resistant resin containing (I), and in particular, the total amount of component (I) and component (II) is
50-98 mol%, component (III) is 50-98% of the whole polymer
2 mol%, and the value of component (I) / (II) is
1/99 to 99/1 (molar ratio), and the weight-average molecular weight in terms of polystyrene is 1 × 10 ³ or more and 5 × 10 ⁶ or less. They have found and completed the present invention.

The compound providing the component (I) is N-methylmaleimide or N-ethylmaleimide, and the component (I)
The compounds giving I) are N-ethylmaleimide, Nn
-Propylmaleimide, Ni-propylmaleimide,
Nn-butylmaleimide, Ni-butylmaleimide, Ns-butylmaleimide, Nt-butylmaleimide, Nn-pentylmaleimide, Nn-hexylmaleimide, Nn-heptylmaleimide, N -N-octylmaleimide, N-laurylmaleimide, N-stearylmaleimide, and the like.
It can be used in combination of more than one kind. Where m is 2
In this case, N-ethylmaleimide is excluded.

The total content of the component (I) and the component (II) is 50 to 98 mol%, preferably 50 to 90 mol%, more preferably 50 to 80 mol% of the whole polymer. On the other hand, if the content of the component (I) exceeds 98 mol%, the resulting polymer becomes brittle, which is not preferable.

Further, the value of component (I) / (II) is 1/99 to 99/1 (molar ratio), preferably 10/90 to 90/10 (molar ratio),
When the value of (I) / (II) exceeds 99/1, the heat resistance of the produced polymer is improved, but the flexibility is reduced, and when it is less than 1/99, the heat resistance is reduced.

The compound providing the component (III) is isobutene, and its content is 2 to 50 mol%, preferably 10 to 50 mol%, more preferably 20 to 50 mol% of the whole polymer.

Also, if necessary, to the extent that the object of the present invention is not impaired,
Other vinyl monomers can be copolymerized. Other vinyl monomers include styrene, α-methylstyrene, vinyltoluene, 1,3-butadiene, isoprene and halogen-substituted derivatives thereof, methyl methacrylate, ethyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, methacrylic acid Methacrylates such as benzyl, acrylates such as methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, phenyl acrylate, benzyl acrylate, vinyl esters such as vinyl acetate and vinyl benzoate, Vinyl ethers such as methyl vinyl ether, ethyl vinyl ether, propyl vinyl ether and butyl vinyl ether, vinyl chloride, vinylidene chloride, maleic anhydride, N-phenylmaleimide, N-carboxyphenyl Reimido, acrylonitrile, ethylene, propylene, 1-butene, 2-butene and 1
One or more compounds selected from hexene are mentioned.

For the polymerization of these monomers, any of known polymerization methods such as bulk polymerization, solution polymerization, suspension polymerization, and emulsion polymerization can be employed, but solution polymerization is particularly preferred.

As the polymerization initiator, benzoyl peroxide, lauryl peroxide, octanoyl peroxide,
Organic peroxides such as acetyl peroxide, di-t-butyl peroxide, t-butylcumyl peroxide, dicumyl peroxide, t-butylperoxyacetate, t-butylperoxybenzoate, or
2,2'-azobis- (2,4-dimethylvaleronitrile),
2,2'-azobis- (2-butyronitrile), 2,2'-azobisisobutyronitrile, dimethyl-2,2'-azobisisobutyrate, 1,1'-azobis- (cyclohexa-1 -Carbonitrile) and the like.

Solvents that can be used in the solution polymerization method include benzene, toluene, xylene, ethylbenzene, cyclohexane, dioxane, tetrahydrofuran, acetone, methyl ethyl ketone, dimethylformamide, isopropyl alcohol, butyl alcohol and the like.

The polymerization temperature can be appropriately set according to the decomposition temperature of the initiator, but is generally preferably in the range of 40 ° C to 150 ° C.

Here, the weight average molecular weight (Mw) of the produced resin can be determined by gel permeation chromatography (GPC). The molecular weight of the resin of the present invention is 1 × 10 ³
It is preferably 5 × 10 ⁶ or less, particularly preferably 1 × 10 ⁴ or more and 5 × 10 ⁵ or less. When the molecular weight exceeds 5 × 10 ⁶ , the moldability deteriorates. When the molecular weight is less than 1 × 10 ³ , problems such as brittleness of the obtained resin occur.

In the resin obtained in the present invention, if necessary, a hindered phenol, a heat stabilizer such as an organic phosphate, a benzotriazole-based UV absorber, a hindered amine-based UV stabilizer, various lubricants, various fillers, etc. It may be added.

(Effect of the Invention) The resin according to the present invention is excellent in transparency, heat resistance and mechanical strength, and is useful in a wide range of fields such as molded articles and films.

EXAMPLES Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited to the examples.

The glass transition temperature (Tg) of the produced polymer is
The measurement was performed at 10 ° C./min. In nitrogen using Seiko Denshi DSC200.

The decomposition temperature (Td) of the produced polymer was measured at -40 ° C./min. In nitrogen using TG / DTA200 manufactured by Seiko Instruments Inc.

The molecular weight of the produced polymer was measured by GPC (Tosoh Corporation H
LC-802A) in terms of polystyrene.

Example 1 1 equipped with a stirrer, a nitrogen inlet tube, a thermometer and a degassing tube
In an autoclave, 33.33 g of N-methylmaleimide (0.3
Mol), 25.03 g (0.2 mol) of N-ethylmaleimide, 2,2
0.8 g of 2'-azobisisobutyronitrile (AIBN) (5.0 ×
^10-3 mol) and 800 ml of dioxane, and after purging with nitrogen several times, 56.1 g (1.0 mol) of isobutene was charged,
The reaction was performed at 60 ° C. for 6 hours.

The reaction contents were poured into ethanol to precipitate a polymer. The obtained polymer was purified by reprecipitation with dioxane-ethanol, and then dried under reduced pressure at 60 ° C. for 24 hours. Yield 5
6.50 g.

Elemental analysis results of the obtained polymer (C; 64.85 wt%, H;
7.89 wt%, N: 8.29 wt%), from the results of liquid chromatography analysis of residual monomers after polymerization and ¹ H-NMR, N-methylmaleimide, N-
The ratio of ethylmaleimide and isobutene is 0.30 / 0.22 / 0.
48 (molar ratio). The resulting polymer has a molecular weight (M
w) 38.2 × 10 ⁴ , Tg = 140 ° C., Td = 395 ° C. The obtained polymer was pressed at 220 ° C. and 5 kg / cm ² to obtain a sheet having a thickness of 1 mm. This sheet is colorless and transparent,
No coloring was observed.

Example 2 37.5 N-ethylmaleimide was added to the reactor described in Example 1.
4 g (0.3 mol), N-n-propylmaleimide 27.83 g
(0.2 mol), 2,2'-azobisisobutyronitrile (AI
0.5 g (3.1 × 10 ⁻³ mol) of BN) and 800 ml of toluene were charged, and after purging with nitrogen several times, 44.98 g (0.8 mol) of isobutene was charged and reacted at 60 ° C. for 5 hours.

The reaction contents were poured into ethanol to precipitate a polymer. The obtained polymer was purified by reprecipitation with toluene-ethanol and then dried under reduced pressure at 60 ° C. for 24 hours. Yield 58.5
It was 0 g.

Elemental analysis results of the obtained polymer (C; 64.66 wt%, H;
7.81 wt%, N: 8.37 wt%) and the result of liquid chromatography analysis of the remaining monomer after polymerization showed that the ratio of N-ethylmaleimide, Nn-propylmaleimide and isobutene in the produced polymer was 0.4 / 0.2. /0.4 (molar ratio), the obtained polymer had a molecular weight (Mw) of 21.2 ×
10 ⁴ , Tg = 120 ° C., Td = 390 ° C. The obtained polymer was pressed at 200 ° C. and 5 kg / cm ² to obtain a sheet having a thickness of 1 mm. This sheet was colorless and transparent, and no coloring was observed.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-4-50210 (JP, A) JP-A-4-50212 (JP, A) JP-A-4-50214 (JP, A) JP-A-1-502 190709 (JP, A) JP-A-4-31407 (JP, A) JP-A-63-291911 (JP, A) JP-A-61-162509 (JP, A) JP-A-61-162543 (JP, A) JP-A-4-31408 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C08F 222/00-222/40 C08F 22/00-22/40 C08F 210/00-210 / 18 C08F 10/00-10/14

Claims (1)

(57) [Claims] 1. The total amount of the following components (I) and (II) is 50 to 98 mol% of the whole polymer, and component (III) is 50 to 2 mol% of the whole polymer. The value of component (I) / (II) is 1/99 to 99/1 (molar ratio)
And the weight average molecular weight in terms of polystyrene is 1 × 10 ³
A transparent heat-resistant resin having a size of at least 5 × 10 ⁶ or less.