摘要:
An improved branch instruction and associated branch control instruction are provided for optimizing handling of branch operations within a pipelined processor. The branch control instruction is adapted so that it can precede the branch instruction in a program sequence and provides branch target address computation information so that branch target addresses can be computed in advance of execution of one or mote associated branch instructions. Because branch target address computation information is disassociated from the actual branch instruction, more space is available within the branch instruction itself to permit additional new types of operations, such as folded-compare, register to register comparisons (including a compare to a zero valued register), predicate evaluations, etc.
摘要:
A process for making a photochromic optical lens is disclosed. In a first embodiment of the process a multi-plied laminate, containing a ply of photochromic thermoplastic polyurethane (herein “TPU”) and a ply containing thermoplastic polycarbonate, is first placed in the cavity of a suitable mold. The ply that contains polycarbonate resin is placed facing the cavity. Thermoplastic polycarbonate resin is then injected into the cavity. In a second embodiment, referred to as an over-mold method, polycarbonate is first injection molded into a molding cavity to form a substrate. Photochromic TPU is, in a subsequent step, injected into the cavity to form a superstrate overlay. In both embodiments, the articles thus molded are suitable for the preparation of optical lenses.
摘要:
A thermoplastic polycarbonate molding composition free from organo phosphorus compounds and having an improved resistance to discoloration caused by exposure to High Intensity Discharge (HID) light and heat is disclosed. Accordingly, the molding composition contains (co)polycarbonate resin, a dimeric benzotriazole and an ester of a 3,5-di-tert-butyl-4-hydroxyhydrocinnamic acid. In a preferred embodiment, a sheet made of (co)polycarbonate resin is rendered improved resistance to discoloration by having applied to at least one of its surfaces an adherent protective film prepared from the polycarbonate composition of the invention.
摘要:
A thermoplastic molding composition having improved release properties is disclosed. The composition contains a polycarbonate and an additive amount of an epoxy conforming structurally to ##STR1## where R is a member selected from the group consisting of glyceryl and trimethyl propyl radicals, x is 0 to 20 and R' is a C.sub.1-4 alkyl radical.
摘要:
A thermoplastic molding composition comprising a resinous blend of polycarbonate, polyester and an impact modifier and an additive amount of a siloxane compound containing a pendant oxirane group is disclosed. It was surprisingly and unexpectedly discovered that unlike the corresponding compositions which contain no siloxane compound, the inventive composition is capable of being dried at low temperatures prior to molding and still maintain high impact strength.
摘要:
A pigmented thermoplastic molding composition is disclosed comprising(i) about 90 to 98 percent of an aromatic polycarbonate,(ii) about 1 to 9 percent of ABS, and(iii) about 1 to 9 percent of a grafted olefinic copolymer which is a graft polymer of one or more unsaturated dicarboxylic acid or the anhydride of said acid on an olefinic copolymer backbone.The composition is noted to have good mechanical properties and the articles molded therefrom have good cosmetics.
摘要:
The invention relates to thermoplastic polycarbonate molding compositions which are rendered resistant to gamma-radiation by incorporating therewith about 0.1 to about 5 percent by weight of a stabilizing agent selected from the group consisting of ##STR1## wherein R is a hydrogen or a halogen atom or a C.sub.1 -C.sub.10 alkyl, a C.sub.6 -C.sub.10 alkyl, a C.sub.6 -C.sub.10 aryl, C.sub.1 -C.sub.22 acyl, C.sub.6 -C.sub.18 alkylaryl or a C.sub.4 -C.sub.10 cycloalkyl radical, n is an integer of at least 1 and preferably 1 to about 100 and Y and Y.sup.1 independently are a hydrogen atom, a C.sub.6 -C.sub.10 aryl, C.sub.1 -C.sub.10 alkyl or a C.sub.6 -C.sub.18 alkylaryl or a C.sub.6 -C.sub.18 arylalkyl radical or ##STR2## wherein m is 1 or 3-6, R.sub.1, R.sub.2 and R.sub.3 independently are a hydrogen atom or a C.sub.1 -C.sub.10 alkyl, C.sub.6 -C.sub.10 aryl or a C.sub.6 -C.sub.18 alkylaryl radical.
摘要:
The present invention relates to polycarbonate molding compositions containing additives of alkali or alkaline earth metal salts, tetrahalogenophthalimides and optional glass fibers, characterized in that they contain additive amounts of bromine.
摘要:
The instant invention relates to a process for the preparation of linear aromatic polycarbonate resins by the known two-phase interfacial process and is directed to the use of perfluoroalkyl sulfonamides as chain stoppers in said process and is further directed to the polycarbonate resins obtainable by the process which resins are suitable in the preparation of thermoplastic molding compositions.
摘要:
Polycarbonates are provided having improved critical thickness values and flame retardant characteristics based upon an aromatic diol and a halogenated thiodiphenol represented by the structural formula ##STR1## wherein X.sub.1 and X.sub.2 are halogen and "a"+"b"=1 to 8; Y.sub.1 and Y.sub.2 are alkyl groups having 1 to 4 carbon atoms; and "c"+"d"=0 to 7. By incorporating an effective amount of the aromatic halogenated thiodiphenol, based upon the total aromatic diol content, into the polymer the critical thickness and flame retardant characteristics of the polycarbonate are substantially improved, a process for the preparation of the monomer of said structural formula is likewise provided.