 Optical data storage compact disc and method for manufacturing the same |
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| Optical pickup device |
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| Photosensitive composition |
| What is claimed as new and intended to be covered by Letters Patent of the United States is: 1. A ... |
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| Photopolymeric composition containing polyamide and dicarboxylic acid diester |
| The photopolymerizable composition of matter of my invention comprises, in its simplest form, a ... |
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| Method for the preparation of planographic printing plates |
| OF THE PREFERRED EMBODIMENTS As is understood from the above given description, the method of the ... |
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| Image forming materials and image forming process |
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| Peak detector circuit |
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| Method of depositing thin films of small dimensions utilizing silicon nitride lift-off mask |
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| Photosensitive image forming material and an image forming method using same |
| OF THE INVENTION The support material used in the present invention supports the poly(vinyl ... |
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Polycarbonate from carbonyl halide, bischloroformate and dihydric phenol
| Details |
Inventors: Mark, Victor;
Assignee: General Electric Company (Mt. Vernon, IN)
Primary Examiner: Anderson; Harold D.
Assistant Examiner:
Attorney, Agent or Firm: Kapustij; Myron B., Barancik; Martin B.
Novel carbonate polymers exhibiting improved processability comprised of the polymerized reaction products of (i) at least one dihydric phenol, (ii) a carbonyl halide carbonate precursor, and (iii) at least one specific bishaloformate. The bishaloformate is selected from bishaloformates represented by the general formulae ##STR1## wherein: X is independently selected from chlorine and bromine radicals; R is selected from alkylene radicals, cycloalkylene radicals, and divalent hydrocarbon radicals; R.sup.3 and R.sup.4 are independently selected from alkylene radicals; and Z is selected from the following divalent radicals ##STR2## the --(R.sup.6).sub.d --Ar--(R.sup.7).sub.e --radical wherein Ar represents a divalent mono-, di- or polynuclear aromatic residue, R.sup.6 and R.sup.7 are independently selected from alkylene radicals, and d and e are independently selected from zero and one, and a divalent organic aliphatic hetero non-cyclic radical containing at least one carbon atom and at least one hetero group selected from ##STR3## The instant polycarbonates are useful in making films, glazing sheets, fibers, and molded articles. |
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DETAILED DESCRIPTION What is claimed is: 1.
High molecular weight thermoplastic aromatic polycarbonate exhibiting improved processability consisting essentially of at least one recurring structural unit represented by the general formula ##STR51## and at least one recurring structural unit represented by the general formula ##STR52## or at least one recurring structural unit represented by the general formula ##STR53## and at least one recurring structural unit represented by the general formula ##STR54## derived from (i) a carbonyl halide carbonate precursor; (ii) at least one dihydric phenol; and (iii) at least one bishaloformate selected from bishaloformates represented by the general formulae ##STR55## wherein: Y is independently selected from halogen, monovalent hydrocarbon or monovalent hydrocarbonoxy radicals, Y' is independently selected from halogen, monovalent hydrocarbon or monovalent hydrocarbonoxy radicals, W is selected from divalent hydrocarbon radicals, ##STR56## n and n' are independently selected from whole numbers having a value of from 0 to 4 inclusive, m is either zero or one, X is independently selected from chlorine or bromine radicals, R is selected from alkylene radicals, cycloalkylene radicals, or divalent radicals represented by the general formula ##STR57## wherein R.
sup.
1 and R.
sup.
2 are independently selected from alkylene radicals, R.
sup.
5 is independently selected from alkyl radicals, A represents a cycloalkylene radical, the letters b and c are independently selected from zero or one, with the proviso that the sum of b and c is at least one, and p represents a whole number having a value of from zero up to the number of replaceable hydrogen atoms present on A, R.
sup.
3 and R.
sup.
4 are independently selected from alkylene radicals, and Z is selected from the following divalent radicals ##STR58## the --(R.
sup.
6).
sub.
d --Ar--(R.
sup.
7).
sub.
e -- radical wherein Ar represents a divalent mono, di- or polynuclear aromatic residue, R.
sup.
6 and R.
sup.
7 are independently selected from alkylene radicals, and the letters d and e are independently selected from zero or one, or a divalent organic aliphatic hetero noncyclic radical containing at least one carbon atom and at least one hetero group selected from ##STR59## 2
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Manufacturing Materials 
