摘要:
Thermoplastic aromatic polycarbonates having average molecular weight Mw of at least 10,000 which contain bifunctional carbonate structural units corresponding to formula (I) ##STR1## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently of one another represent hydrogen, a C.sub.1 -C.sub.12 -hydrocarbon, halogen,m is 2 or 3 andX represents hydrogen or a C.sub.6 -C.sub.12 hydrocarbon, at least one substituent X being a C.sub.6 -C.sub.12 hydrocarbon radical,in quantities of from 100 to 1 mol-% based on the total quantity of difunctional carbonate structural units in the polycarbonate.
摘要:
The new thermotropic polyesters containing recurring structural units corresponding to the following formulae ##STR1## show excellent mechanical properties and good processibility. They may be used in the usual way for the production of moldings, filaments, fibers and films.
摘要:
The mixtures according to the present invention of polyalkylene terephthalates, certain new polycarbonates and/or polyester-carbonates and elastomers have a particularly favourable low temperature strength/heat distortion point relationship compared with conventional moulding compositions containing known polycarbonates. The mixtures are used for the production of, in particular, shaped articles.
摘要:
Thermoplastic aromatic polycarbonates having average molecular weights Mw of at least 10,000 which contain bifunctional carbonate structural units corresponding to formula (I) ##STR1## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently of one another represent hydrogen, a C.sub.1 -C.sub.12 hydrocarbon radical, halogen andR.sup.5, R.sup.6 and R.sup.7 represent hydrogen, iso-C.sub.3 -C.sub.5 -alkyl,one of the substituents R.sup.5, R.sup.6 or R.sup.7 not being hydrogen, in quantities of from 100 to 1 mol-%, based on the total quantity of difunctional carbonate structural units in the polycarbonate.
摘要:
A thermoplastic molding composition comprising (i) an aromatic polycarbonate having high thermal dimensional stability and based on a substituted dihydroxydiphenylcycloalkane, (ii) other aromatic polycarbonate resin and (iii) graft, particle-type diene rubbers is disclosed. The composition is characterized by its good Izod impact strength. A process for preparing the molding composition and their use for manufacturing molded bodies are also disclosed.
摘要:
An article for an optical application is disclosed comprisinga) about 0.1 to 99.9 wt. % of a thermoplastic, aromatic polycarbonate resin containing carbonate structural units corresponding to (Ia): ##STR1## wherein R.sup.1 and R.sup.2 independently represent hydrogen, halogen, C.sub.1 -C.sub.8 alkyl, C.sub.5 -C.sub.6 cycloalkyl, C.sub.6 -C.sub.10 aryl or C.sub.7 -C.sub.12 aralkyl; m represents an integer of from 4 to 7;R.sup.3 and R.sup.4, which are selected individually for each X, independently represent hydrogen or C.sub.1 -C.sub.6 alkyl; andX represents a carbon atom; provided that R.sup.3 and R.sup.4 both represent alkyl on at least one X atom; andb) from 99.9 to 0.1 wt. % of at least one thermoplastic polycarbonate other than component (a).
摘要:
The new aromatic ethers of the formulae ##STR1## can be used for the preparation of plastics which, in turn, can be processed further to give moulded articles, films, foils and filaments. The plastics prepared from the new aromatic ethers are distinguished by exceptional dimensional stability under heat.
摘要:
Polyesters and polyester-carbonates based on dihydroxydiphenylcycloalkanes corresponding to the following general formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently represent hydrogen, a C.sub.1 -C.sub.12 hydrocarbon radical or halogen; m represents an integer of from 4 to 7,R.sup.5, and R.sup.6, may be selected individually for each X and independently represent hydrogen or C.sub.1 -C.sub.6 alkyl; andX represents carbon;with the proviso that, on at least one atom X, R.sup.5 and R.sup.6 simultaneously represent alkyl.
摘要:
Mixtures containing(a) 5 to 70% by weight polycarbonate based on 2-(4-hydroxphenyl)-2-(3-hydroxphenyl)-propane and(b) 95 to 30% by weight polycarbonate based on bis-2,2-(4-hydroxy-3,5-dimethylphenyl)propane, the sum of the percentages by weight of components (a)+(b) being 100% by weight.
摘要:
A thermoplastic molding composition containing an aromatic polycarbonate and a particular siloxane compound is disclosed. The composition which is based on a polycarbonate resin having bifunctional structural units corresponding to formula (Ia) ##STR1## wherein R.sup.1 and R.sup.2 denote, independently of one another, hydrogen, halogen, C.sub.1 -C.sub.8 alkyl, C.sub.5 -C.sub.6 -cycloalkyl, C.sub.6 -C.sub.10 -aryl, or C.sub.7 -C.sub.12 -aralkyl,m is an integer from 4 to 7,R.sup.3 and R.sup.4 selected individually for each X, denote, independently of one another, hydrogen or C.sub.1 -C.sub.6 -alkyl, andX stands for carbon,under the condition that R.sup.3 and R.sup.4 are both alkyl groups on at least one X atom, andcontains from 0.001 to 1% by weight of at least one siloxane corresponding to formula (II) ##STR2## wherein R denotes hydrogen, C.sub.1 -C.sub.20 -alkyl, C.sub.6 -C.sub.10 -aryl or C.sub.1 -C.sub.10 -alkoxy,B denotes R or A,r, s and t independently denote an integer from 0 to 200, or to formula (III) ##STR3## wherein R has the same meaning as in formula (II)u denotes an integer from 1 to 20, and v and w denote an integer from 0 to 20,and wherein the sum u+v+w is greater than 3, andA denotes a C.sub.1 -C.sub.20 -alkyl group or a C.sub.6 -C.sub.10 -aryl group is characterized in its improved heat distortion temperature and good aging properties.