Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1992-06-08
1994-11-29
Lipman, Bernard
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
5253799, 5253305, 525380, C08F 832
Patent
active
053691890
DESCRIPTION:
BRIEF SUMMARY
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a process for the preparation of heat resistant and transparent acrylic resin. More particularly, it relates to a process for the preparation of transparent acrylic resin which is improved in heat resistance by introducing imide structure into acrylic polymers in the presence or absence of a catalyst.
Up to date, since methylmethacrylate resin has had good transparency, weatherability and mechanical properties, it has been used in highly efficient optical materials, decorative materials, automobiles and electric products. However, having low heat deflection temperature of less than 100.degree. C., methylmethacrylate resin has not been used in the field of requiring heat resistance. Therefore, we have required its heat resistance improved.
As a general the method to improve the heat resistance of acrylic resin is as follows:
1. the method of heating react acrylic acid, methacrylic acid or their ester polymer with a primary amine in the solvent having high boiling point (U.S. Pat. No. 2,146,209),
2. the method of reacting methylmethacrylate polymer with primary amine in the presence of water (U.S. Pat. No. 3,284,425),
3. the method of reacting acrylic polymer with anhydrous ammonia or anhydrous primary amine in a extruder (U.S. Pat. No. 4,246,374), and
4. the method reacting methacrylate resin with anhydrous ammonia or anhydrous primary amine in the presence of a solvent (JP 63-36696).
According to the above-mentioned method (1), it is difficult to separate solvents completely from the imidized polymer product on a commercial scale, because the boiling point of the solvent is high. Therefore, since the obtained imidized polymer is colored, the transparency of final product is deteriorated.
Also, as the imidiazation reaction according to the above-mentioned method (2) is carried out by using a great quantity of water as a dispersion medium, water phase and polymer phase are separated. Accordingly, it is difficult to obtain uniform imidized polymer. As the reaction is carried out at higher than the softening temperature of acrylic polymer, reaction product coagulates around agitator and handling of the reaction product is difficult.
Also, according to the above-mentioned method (3) it is difficult to obtain uniform imidized polymers, because polymers having high viscosity are reacted with gaseous primary amines.
Also, according to the above-mentioned method (4), it is required to remove moisture from acrylic polymers, solvents and amines in order to prevent hydrolysis.
Therefore, the present inventors investigated a process assiduously to improve the above-mentioned problems. We could produce acrylic resin having heat resistance and transparency through the following methods.
The object of the present invention is to provide a process for the preparation of acrylic resin which has excellent heat resistance and transparency and maintains all of the good original characteristics of acrylic resin by selecting the suitable solvent dissolving both reactants and products.
The other object of the present invention is to provide a process for the preparation of acrylic resin which has excellent heat resistance and transparency by adding some water together with a suitable solvent into a reaction system.
The another object of the present invention is to provide a process for the preparation of acrylic resin which has excellent heat resistance and transparency by adding a catalyst and a suitable solvent to reaction system, and using ammonium bicarbonate or their derivatives as a imidizing agent.
The another object of the present invention is to provide a process for the preparation of acrylic resin which has excellent heat resistance and transparency by adding catalyst in the presence of a suitable solvent and pouring some water into the reaction system.
The another object of the present invention is to provide a process for the preparation of acrylic resin which has excellent heat resistance and transparency by adding catalyst to the reaction syste
REFERENCES:
patent: 2146209 (1939-02-01), Graves
patent: 3284425 (1966-11-01), Schroder et al.
patent: 4246374 (1981-01-01), Kopchik
patent: 5096976 (1992-03-01), Sasaki et al.
patent: 5225496 (1993-07-01), Yammamoto et al.
Hur Young S.
Kim Jin B.
Lipman Bernard
Lucky Ltd.
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