Hydrogenated norbornene ring-opening polymerization product, a p

Details Hydrogenated norbornene ring-opening polymerization product, a p Hydrogenated norbornene ring-opening polymerization product, a p

1996-01-22

1997-10-28

Zitomer, Fred

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525338, 5253321, 526281, 526308, 526309, C08G 6108, C08G 6106, C08F 3208

Patent

active

056819005

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a thermoplastic hydrogenated norbornene ring-opening polymerization product which is excellent in heat resistance, transparency, low birefringent properties, weather resistance, light resistance, low water absorption properties, moisture resistance, small dielectric constant, small dielectric loss, chemical resistance, etc. and has a high refractive index; and an optical material, a medical tool or material, an electrical insulating material and a tool or material for treating an electronic part, which are made of said hydrogenated polymerization product.


BACKGROUND ART

It is known that thermoplastic norbornene polymers which are macromolecular materials possessing improved low birefringent properties, moisture resistance and heat resistance, for example, hydrogenated ring-opening polymerization products of a norbornene type monomer, addition copolymers of a norbornene type monomer and ethylene, etc. have excellent characteristics as optical materials such as optical lenses and optical disc base plate (Japanese Patent Unexamined Publication Nos. 60-26024, 64-24826, 60-168708, 61-115912 and 61-120816, etc.).
Thermoplastic norbornene resins begin to be used also in lenses for glasses, etc. as resins having various desirable performance characteristics, and are expected as materials for high-performance lenses and the like. Conventional hydrogenated norbornene ring-opening polymerization products, however, have a refractive index of about 1.53 at most. For satisfying the demand for a further advanced technical knowledge, an optical material having a high refractive index is desired, but no process for producing a thermoplastic norbornene resin having a high refractive index has been known.
It is known that resins used as optical materials, such as poly(methyl methacrylate)s and polycarbonates are given a high refractive index by incorporation of aromatic ring structures or halogen atoms (Japanese Patent Unexamined Publication Nos. 61-42602 and 60-166307, etc.). As to addition polymers among thermoplastic norbornene resins, a resin obtained from a norbornene type monomer having an aromatic ring structure has been known (Japanese Patent Unexamined Publication No. 2-289637), but the refractive index and the like of this resin have not been known in the concrete.
For using a ring-opening polymerization product of a norbornene type monomer as an optical material, it has been usually modified into a resin containing substantially no unsaturated bond in the backbone structure by hydrogenation before use. However, when a norbornene ring-opening polymerization product having aromatic ring structures is hydrogenated under usual conditions by the use of a catalyst such as a supported hydrogenation catalyst, not only the unsaturated bonds in the backbone structure but also the aromatic ring structures in the resin structure are hydrogenated to be saturated. Therefore, the aromatic ring structures are lost, so that no hydrogenated norbornene ring-opening polymerization product having aromatic ring structures can be obtained.
For example, Japanese Patent Unexamined Publication No. 3-273043 discloses hydrogenation of a norbornene ring-opening polymerization product containing a ring-opening polymerization product of a norbornene type monomer having an aromatic ring structure. However, no hydrogenated norbornene ring-opening polymerization product having aromatic ring structures has been disclosed in the concrete. There have not been disclosed or suggested the idea of leaving aromatic ring structures by choosing a hydrogenation catalyst and hydrogenation reaction conditions and a hydrogenated norbornene ring-opening polymerization product retaining aromatic ring structures.


DISCLOSURE OF THE INVENTION

The present inventors earnestly investigated in order to develop a novel resin usable in optical materials, medical tools and materials, electrical insulating materials, etc., and consequently found that a resin obtained by hydrogenating the unsaturated bonds in the backbo

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