JPS59131611A - Copolymer resin having high refractive index - Google Patents

Abstract

PURPOSE:A copolymer resin useful as lenses and other transparent commodities, hardly being damaged, light-weight, easily processed, obtained by copolymerizing a monomer having high refractive index with a monomer having good transparency. CONSTITUTION:(A) An aromatic conjugated hydrocarbon (e.g., trans-stilbene, 1,4-diphenylbutadiene, 1,6-diphenylhexatriene, etc.) shown by the formula C6H5- (CH=CH)n-C6H5 (n is 1-3) having high refractive index is polymerized with (B) a polycarbonate (e.g., diethylene glycol bisallyl carbonate, etc.), (meth) acrylic acid ester [e.g., methyl (meth)acrylate, propylene glycol methacrylate, etc.] having good transparency, to give the desired resin.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composition of a copolymer resin having a high refractive index for use in lenses and other transparent products.

Originally, inorganic glasses, such as lead glass, have been widely used for materials with high refractive index required for transparent products such as lenses. As a result, there were many restrictions on its use.Transparent resins, which have been significantly developed in recent years, have been widely applied to eyeglass lenses, and have gradually conquered the lens industry due to their lightness, resistance to breakage, and other properties that compensate for the shortcomings of inorganic glass. However, the biggest drawback of plastics is that their refractive index is lower than that of inorganic glass, and this has been the biggest constraint for using them in lenses with large diopters.For example, plastics with the highest refractive index Plasti.

Even with polydiethylene glycol bisallyl carbonate (trade name ax-so), which is a cleanser, the clam is /, 1
0, which is much smaller than 1.75 for lead glass.

In order to increase the refractive index, it is generally possible to introduce a hapogen, and several polymers have been synthesized based on this idea.These have a refractive index close to that of glass, but they still have problems with transparency. However, the current situation is that it is far from being put into practical use.

The present invention was developed by carrying out co-η (combination) using diethylene and recall bisallyl carbonate, which are used as materials for skin-on lenses, and a transparent monomer with a high refractive index, and by testing a large number of reaction conditions. , I got something that I was satisfied with.

Among the copolymers used in the present invention, those having a high refractive index.

Specific examples of mer (A) include trans-stilbene,
Cis-stilbene, L4-diphenylbutadiene, L6
-diphenylhexatriene, etc.

Specific examples of highly transparent 7mers include diethylene glycol bisallyl carbonate (OR-39),
) Diethylene glycol bisallyl carbonate, ethylene glycol bisallyl carbonate, polypropylene glycol bisallyl carbonate, methyl methacrylate, methyl acrylate, ethyl methacrylate, ethyl acrylate, diethylene glycol dimethacrylate,
but-tetrapyrene glycol dimethacrylate, etc.

The polymerization catalyst used in the present invention contains 11 transparent monomers.
Refers to all openers that can be combined in one reaction. Among these, as radical polymerization catalysts, peroxides and jetrylic acid are conveniently used.The mixing ratio of A and transparent monomer is 30% or more. A content of 5% to 30% is desirable.Although it depends on the purpose of use, if the content of A exceeds this value, the transparency decreases, the risk of cracking increases, and the strength deteriorates.

The refractive index values in the examples were calculated by molding a plate with a thickness of 5 mm and measuring the focal length of the plate using a floating microscope. In addition, the values obtained from the thin film A and B refractometers were corrected.

Example (1) Diethylene glycol picarbonate (709) trans-stilbene (30) and diisopropyl peroxydicarbonate (29) were mixed and cured by heating at 100°C for 10 hours in a nitrogen stream.The resulting transparent resin was In a strength test, it showed the same strength as polydiethylene glycol biscarbonate and had a refractive index of 1.683. This value is 0R-
Example (2) In which 80 g of intermethacrylic methyl], 20 g of a-diphenylbutadiene, and 5 g of benzoyl peroxide were mixed and the mixture was mixed with 1 g of benzoyl peroxide in a nitrogen stream.
It was cured by 20 PJJ at 5,000 yen. The obtained copolymer was transparent and 5. When molded to a thickness of Qw, the light green transmittance was 95.5 and the refractive index was 1.579.

This value is an increase of 0.14 compared to polymethyl methacrylate, and is useful as a high refractive index lens.

that's all

Claims (1)

[Claims] The general formula is 06)! -(OH-0)1); a6H, (A), an aromatic conjugated hydrocarbon (A) where n is 1 to 3 in the formula, carbonates with good transparency, and acrylic esters A transparent resin with a high refractive index that is a copolymer with methacrylic acid esters.