Process for making a polymer for an optical substrate by hydrogenating a cycloolefin copolymer
AssigneeThe B. F. Goodrich Company
InventorDennis C. Shen
Life of this patent
Estimating the term…
Abstract
Substantially optically clear molding compositions comprising polymerized cycloolefin monomers (e.g., norbornene-type polymers) which, subsequent to polymerization have been hydrogenated are provided. The polymers have a weight average molecular weight of from about 37-47.times.10.sup.3.
Claims12
A process for forming a substantially clear hydrogenated copolymer suitable for molding into an optical substrate, comprising,
- a) polymerizing a mixture of comonomers comprising from 60-95% methyltetracyclododecene and 5-40% dicyclopentadiene,
- based on the total weight of said mixture, in the presence of a catalyst effective to promote ring-opening polymerization of said comonomers, to yield an unsaturated copolymer;
- and, b) hydrogenating said unsaturated copolymer to produce said hydrogenated copolymer having a weight average molecular weight in the range from 35.times.10.sup.3 to 50.times.10.sup.3, and a melt flow index in the range from 40-65 g/10 min at 300.degree. C. with a 1.2 kg load, as determined on a Tinius Olsen melt-flow index system.
A process for forming a substantially clear hydrogenated copolymer suitable for molding into an optical substrate, comprising,
- a) polymerizing a mixture of comonomers comprising from 85-95% methyltetracyclododecene and 5-15% methylnorbornene, based on the total weight of said mixture, in the presence of a catalyst effective to promote ring-opening polymerization of said comonomers, to yield an unsaturated copolymer;
- and,
- b) hydrogenating said unsaturated copolymer to produce said hydrogenated copolymer having a weight average molecular weight in the range from 35.times.10.sup.3 to 50.times.10.sup.3, and a melt flow index in the range from 40-65 g/10 min at 300.degree. C. with a 1.2 kg load, as determined on a Tinius Olsen melt-flow index system.
A process for forming a substantially clear hydrogenated copolymer suitable for molding into an optical substrate, comprising,
- a) polymerizing a mixture of comonomers comprising form 50-90% methyltetracyclododecene, 2-10% methylnorbornene, and 5-50% dicyclopentadiene, based on the total weight of said mixture, in the presence of a catalyst effective to promote ring-opening polymerization of said comonomers, to yield an unsaturated copolymer;
- and,
- b) hydrogenating said unsaturated copolymer to produce said hydrogenated copolymer having a weight average molecular weight in the range from 35.times.10.sup.3 to 50.times.10.sup.3, and a melt flow index in the range from 40-65 g/10 min at 300.degree. C. with a 1.2 kg load, as determined on a Tinius Olsen melt-flow index system.
A process for forming a substantially clear hydrogenated copolymer suitable for molding into an optical substrate, comprising,
- a) polymerizing a mixture of comonomers comprising from 60-95% tetracyclododecene and 5-40% dicyclopentadiene, based on the total weight of said mixture, in the presence of a catalyst effective to promote ring-opening polymerization of said comonomers, to yield an unsaturated copolymer;
- and,
- b) hydrogenating said unsaturated copolymer to produce said hydrogenated copolymer having a weight average molecular weight in the range from 35.times.10.sup.3 to 50.times.10.sup.3, and a melt flow index in the range from 40-65 g/10 min at 300.degree. C. with a 1.2 kg load, as determined on a Tinius Olsen melt-flow index system.
A process for forming a substantially clear hydrogenated copolymer suitable for molding into an optical substrate, comprising,
- a) polymerizing a mixture of comonomers comprising from 85-95% tetracyclododecene and 5-15% methylnorbornene, based on the total weight of said mixture, in the presence of a catalyst effective to promote ring-opening polymerization of said comonomers, to yield an unsaturated copolymer;
- and,
- b) hydrogenating said unsaturated copolymer to produce said hydrogenated copolymer having a weight average molecular weight in the range from 35.times.10.sup.3 to 50.times.10.sup.3, and a melt flow index in the range from 40-65 g/10 min at 300.degree. C. with a 1.2 kg load, as determined on a Tinius Olsen melt-flow index system.
A process for forming a substantially clear hydrogenated copolymer suitable for molding into an optical substrate, comprising,
- a) polymerizing a mixture of comonomers comprising from 50-90% tetracyclododecene, 2-10% methylnorbornene, and 5-50% dicyclopentadiene, based on the total weight of said mixture, in the presence of a catalyst effective to promote ring-opening polymerization of said comonomers, to yield an unsaturated copolymer;
- and,
- b) hydrogenating said unsaturated copolymer to produce said hydrogenated copolymer having a weight average molecular weight in the range from 35.times.10.sup.3 to 50.times.10.sup.3, and a melt flow index in the range from 40-65 g/10 min at 300.degree. C. with a 1.2 kg load, as determined on a Tinius Olsen melt-flow index system.
Dependencies are inferred from the claim text.