摘要:
A high data density pre-recorded optical media disc having a data density of at least 7.5 Gigabytes per disc layer or 0.17 Gigabytes per square cm (Gb/cm ) per layer and a degree or replication such that the average pit depth equals 1/4 to 1/8 times (the wavelength of the laser divided by the refractive index of the disc); or a rewritable optical media disc having a data density of at least 0.05 Gb/cm , wherein at least 75 percent replication is achieved as measured by a combination of groove height and the left and right sidewall angles, and wherein the pre-recorded or rewritable disc has a retardation of less than 25 nm per 0.6 mm substrate thickness, and a water absorbance of less than 0.5 percent as measured according to ASTM D570.
摘要:
The present invention is directed to a hydrogenated copolymer of a vinyl aromatic and isoprene monomer which produces optical media discs having extremely low birefringence.
摘要:
The present invention is directed to a process for producing a hydrogenated polymer or copolymer by hydrogenating prior to polymer isolation or finishing.
摘要:
A method comprising forming a coating solution which comprises a matrix precursor material, a porogen material and a solvent, by selecting a polyarylene matrix precursor material which cross-links to form a matrix with a calculated cross-link moeity density of at least 0.003 moles/ml, and reacting the polyarylene matrix precursor material with a porogen which is linear oligomer or polymer which is formed from monomers comprising alkenyl or alkynyl functional monomers, which has reactive end groups and a weight average molecular weight in the range of less than about 5000, where the porogen is present in amounts in the range of about 10 to less than 50 percent by weight based on total weight of porogens and matrix precursor material.
摘要:
The present invention is directed to a hydrogenated block copolymer of a vinyl aromatic and butadiene which is useful in the preparation of optical media discs having very low birefringence.
摘要:
The present invention is directed to a process for producing a hydrogenated polymer or copolymer by hydrogenating prior to polymer isolation or finishing.
摘要:
Compositions comprising hydrogenated block copolymers can be successfully used in a variety of applications including films, profiles, sheets, pultruded articles, fibers, coated articles, injection molded articles and blow or rotational molded articles.
摘要:
The present invention is a hydrogenated block copolymer comprising at least two distinct blocks of hydrogenated vinyl aromatic polymer, and at least one block of hydrogenated conjugated diene polymer, characterized by: a) a total number average molecular weight (Mnt) of from 30,000 to 120,000, wherein each hydrogenated vinyl aromatic polymer block (A) has a Mna of from 5,000 to 50,000 and the hydrogenated conjugated diene polymer block (B) has a Mnb of from 4,000 to 110,000; and b) a hydrogenation level such that each hydrogenated vinyl aromatic polymer block has a hydrogenation level of greater than 90 percent and the hydrogenated conjugated diene polymer block has a hydrogenation level of greater than 95 percent.