JP2928825B2 - Transparent thermoplastic resin - Google Patents

Description

The present invention relates to a transparent heat-resistant resin. The resin according to the present invention has excellent transparency and heat resistance and can be used in a wide range of fields such as molded articles 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-61-14171, JP-A-61-171708 and 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 JP-A-61-76512. 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)
It is a transparent heat-resistant resin containing I), and particularly, when the component (I) is 50 to 98 mol% of the whole polymer, the component (II)
And the total amount of (III) is 50 to 2 mol% of the whole polymer
And the value of component (II) / (III) is 1/99 to 9
9/1 (molar ratio), and found that the transparent heat-resistant resin characterized in that the weight average molecular weight in terms of polystyrene is 1 × 10 ³ or more and 5 × 10 ⁶ or less satisfies the above object,
The present invention has been completed.

(R ₁ is an alicyclic alkyl group represented by C _n H _2n-1 ,
n represents an integer of 3 to 8) (R ₂ is hydrogen or an alkyl group having 1 to 8 carbon atoms, R ₃ is an alkyl group having 1 to 8 carbon atoms, R ₄ is when R ₂ is hydrogen, an alkyl group having 2 to 8 carbon atoms, R ₂ Is an alkyl group having 1 to 8 carbon atoms when is an alkyl group.) The compound giving component (I) is N-cyclopropylmaleimide, N-cyclobutylmaleimide, N-cyclopentylmaleimide, N-cyclohexylmaleimide, N-cycloaliphatic alkyl-substituted maleimides such as -cycloheptylmaleimide and N-cyclooctylmaleimide, which can be used alone or in combination of two or more.

The compound providing component (II) is isobutene, and the compound providing component (III) is 2-methyl-
1-butene, 2-methyl-1-pentene, 2-methyl-
1-hexene, 2-methyl-1-heptene, isooctene, 2-methyl-1-octene, 2-ethyl-1-butene, 2-ethyl-1-pentene, 2-methyl-2-butene, 2-methyl- Examples thereof include 2-pentene and 2-methyl-2-hexene, and these can be used alone or in combination of two or more.

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

The total content of the components (II) and (III) is 2 to 50 mol%, preferably 10 to 50 mol%, more preferably 20 to 50 mol% of the whole polymer.

When the component (III) has a straight-chain alkyl group such as 2-methyl-1-heptene, the flexibility is excellent but the heat resistance tends to decrease, and the bulky alkyl such as isooctene is used. Group, or 2
In the case of a 3-substituted olefin such as -methyl-2-butene, the heat resistance is improved, but the mechanical strength tends to decrease. Therefore, in order to satisfy the object of the present invention, the value of component (II) / (III) is 1/99 to 99/1 (molar ratio), preferably 30/70 to 90/10 ( Molar ratio).

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, otanoyl 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- (cyclohexane-1- Azo initiators such as carbonitrile).

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, and 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 has excellent transparency and heat resistance, 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 in nitrogen at a temperature rising rate of 10 ° C./min. Using a DSC290 manufactured by Seiko Denshi.

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
N-cyclohexylmaleimide 89.6 in autoclave
g (0.5 mol), isooctene 22.4 g (0.2 mol) and 2,2 g
0.8 g of 2'-azobisisobutyronitrile (AIBN) (5.0 ×
^10-3 mol) and toluene (800 ml), and after purging with nitrogen several times, isobutene (44.9 g, 0.8 mol) was charged.
Reaction was carried out at 8 ° C. for 8 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. The yield is 105.
It was 0 g.

Elemental analysis results of the obtained polymer (C; 71.8 wt%, H; 9.
From the results of gas chromatography analysis of the remaining monomer after polymerization and the residual monomer after polymerization, the ratio of N-cyclohexylmaleimide, isobutene and isooctene in the produced polymer was 0.50 / 0.45 / 0.05 (molar ratio). Met. The resulting polymer has a molecular weight (Mw) of 24.7 × 10 ⁴ , Tg
= 201 ° C and Td = 402 ° C. The obtained polymer is 300
A sheet having a thickness of 1 mm was obtained by pressing at 5 ° C. and 5 kg / cm ² . This sheet was colorless and transparent, and no coloring was observed.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-50211 (JP, A) JP-A-4-50212 (JP, A) JP-A-4-50214 (JP, A) JP-A-1-50211 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 following component (I) is 50 to 98 mol% of the whole polymer, and the total amount of the components (II) and (III) is 50 to 2 mol% of the whole polymer. A transparent component, wherein the value of component (II) / (III) 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. Heat resistant resin. (R ₁ is an alicyclic alkyl group represented by C _n H _2n-1 ,
n represents an integer of 3 to 8) (R ₂ is hydrogen or an alkyl group having 1 to 8 carbon atoms, R ₃ is an alkyl group having 1 to 8 carbon atoms, R ₄ is when R ₂ is hydrogen, an alkyl group having 2 to 8 carbon atoms, R ₂ Represents an alkyl group having 1 to 8 carbon atoms when is an alkyl group)