Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1990-05-14
1993-04-20
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C08F 2400
Patent
active
052044254
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to polyalicyclic polyacrylic acid ester derivatives. This polymer resin composition is particularly useful as a resin for optical material to be used for optical lenses, digital audio disks, or optical memory disks.
BACKGROUND TECHNIQUE
Acrylic resins such as polymethyl methacrylate have been used for optical lenses, digital audio disks, optical memory disks, optical fibers, etc. by virtue of their properties such as transparency and strength (Japanese Unexamined Patent Publications No. 74701/1982 and No. 180906/1988. However, with conventional acrylic resins, drawbacks have been pointed out such that their glass transition temperature is low, and their water absorptivity is high. Various methods have been proposed to solve these problems. For example, Japanese Unexamined Patent Publications No. 151413/1987 and No. 72708/1988 and Japanese Examined Patent Publication No. 28419/1971 disclose methods intended to improve the heat resistance or to reduce the after absorptivity. However, these methods still have many problems with respect to e.g. the moldability and have not been practically used.
As opposed to such acrylic resins, epoxy resins have been known as resins having high heat resistance. However, epoxy resins have a problem with respect to e.g. the molding time, although they are excellent in the optical properties such as transparency and optical anisotropy like the acrylic resins. In the bulk reaction by photocuring by means of ultraviolet rays, a problem has been pointed out such that it is difficult to attain a high molecular weight or three dimensional crosslinking.
SUMMARY OF THE INVENTION
Under the above described circumstances, the present inventors intend to provide a polymer resin composition having a high glass transition temperature and a small water absorptivity while maintaining the characteristics of the conventional methacrylic resins with respect to the transparency and strength and a shaped product of optical material formed from such polymer resin composition.
The present inventors have conducted extensive studies to solve the above problems. As a result, they have found that a derivative comprising, as a basic constituting component, a polyalicyclic acrylic acid ester derivative represented by the following formula (2): ##STR2## provides physical properties excellent in the optical uniformity, mechanical strength, heat resistance and water absorptivity, and it is possible to obtain a shaped product of optical material by using this derivative. Thus, the present invention has been accomplished.
Namely, the present invention provides a polyalicyclic polyacrylic acid ester derivative represented by the formula (1): ##STR3## (wherein R and R' independently represent a hydrogen atom or a methyl group, R.sub.1 represents a C.sub.1 -C.sub.4 linear or branched alkyl group, A represents a structural unit derived from a group copolymerizable with an acrylic acid ester, and l, m and n are, respectively, from 0.04 to 1.0, from 0 to 0.96 and from 0 to 0.5 in this order, provided that their sum is 1, and when m is not higher than 0.2, n is a number of not higher than 0.01) and having a molecular weight of from about 5,000 to about 1,000,000. As an acrylic acid ester derivative, from which the structural unit A is derived, a monomer represented by the formula: ##STR4## may be exemplified.
A polymer represented by the formula (3) ##STR5## (wherein R is a hydrogen atom or a methyl group), wherein m and n are simultaneously 0 in the formula (1), has extremely high heat resistance, and its glass transition temperature is at least 200.degree. C. This is desirable. On the other hand, the melting temperature is high, and when a resin composition containing this polymer is to be molded, a temperature substantially higher than those for other acrylic resins will be required.
On the other hand, a polymer wherein m is other than 0 and n is 0 in the formula (1), i.e. a polymer represented by the formula (4): ##STR6## (wherein R and R' independently represe
REFERENCES:
patent: 4138300 (1979-02-01), Kaetsu et al.
patent: 5043366 (1991-08-01), Isozaki
Oshima Noriaki
Seita Toru
Sekimoto Kenichi
Takahashi Yousuke
Schofer Joseph L.
Tosoh Corporation
Walker Alex H.
LandOfFree
Polyalicyclic polyacrylic acid ester derivatives does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polyalicyclic polyacrylic acid ester derivatives, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polyalicyclic polyacrylic acid ester derivatives will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1526860