摘要:
In order to improve the adhesion of coatings, especially metal coatings, to the surfaces of plastic components, the latter are pretreated in low-pressure plasma with a process gas containing sulphur hexafluoride (SF.sub.6) which is substantially free of oxygen, the plastic surfaces being kept free of fluorine deposits or inclusions during the pretreatment.
摘要:
Highly crystalline, rapidly crystallizing thermoplastic compositions containing:a) 70-99.5% by weight of a polyphenyl sulphide having a melt viscosity of at least 5 Pas (measured at 306.degree. C. and at a shear stress of 10.sup.2 Pa) andb) 0.5-30% by weight, relative to a) and b) of an oligomeric ester having at least two repeating ester monomeric units and a maximum molecular weight, expressed as a number average, of 6000.
摘要:
The invention relates to a fibre-reinforced thermoplastic semi-finished product includes a thermoplastically processible polymer and long individual reinforcing fibres which form a coherent skeleton, which product can be processed in stamping presses to give moulded articles having a very high surface quality and very good physical properties, and a process for producing this product.
摘要:
This disclosure is concerned with flame retarded polyethylene terephthalate compositions which have enhanced drip suppression due to the incorporation of a two-phase polyacrylate comprised of a cross-linked elastomeric first phase to which a rigid thermoplastic second phase has been grafted. These compositions have enhanced crystallization velocities and therefore may be molded into colder molds and with shorter mold cycles than has been conventional for polyethylene terephthalate compositions.
摘要:
Polyalkylene terephthalates containing 0.5-30% by weight of oligomeric carboxylic acid polyesters have a higher crystallization speed and thus allow lower mold temperatures and shorter injection cycles. The polyalkylene terephthalates generally have intrinsic viscosities in excess of about 0.4 dl/g in 1:1 phenol tetrachloroethane at 25.degree. C. and are at least about 90 mol % terephthalic acid based. The oligomer additive is based on carboxylic acids, with sebacic and adipic being preferred, and aliphatic, cycloaliphatic or araliphatic dihydric alcohols. This additive has a minimum polymerization degree of 2 and a maximum number-average molecular weight of about 6000.Faster crystallization rates can be imparted to polyalkylene terephthalates by mixing them with the ester additive and melt homogenizing the mixture.
摘要:
The present invention is concerned with polyalkylene terephthalate molding compositions which have improved crystallization behavior as a result of blending with selected sulphonic acid esters. The addition of an effective amount of these esters, generally between about 0.5 to 30 wt. %, improves the rate of crystallization of polyalkylene terephthalates such as polyethylene terephthalate thus permitting the use of shorter mold residence and lower mold temperatures in injection molding.The invention is also concerned with a process for improving the crystallization behavior of polyalkylene terephthalates by melt blending them with selected sulphonic acid esters.
摘要:
An arrangement for motorized assistance in movement of manually movable components of medical apparatuses is provided. The arrangement includes at least one torque sensor that is arranged in a drivetrain of a movable component of a medical apparatus. The at least one torque sensor detects the moments occurring in the drivetrain in a stationary state and in motion. Using an evaluation unit, the torque detected by the at least one torque sensor may be compared against a predefinable first threshold value. The first threshold value is predefined according to a possible position of the movable component. The arrangement includes a drive unit, by which the drive of the drivetrain may be provided with motorized assistance when the first threshold value is exceeded.
摘要:
A dielectric capacitor having self healing properties is disclosed. The capacitor includes a film made of an amorphous aromatic copolycarbonate having a weight average molecular weight of at least 10,000 and a glass transition temperature of at least 160° C. In a preferred embodiment the copolycarbonate includes structural units derived from bisphenol TMC. Also disclosed is a process for making the film.
摘要:
A UV-stabilizer comprising a mixture of hydroxybenzotriazole and a hydrolyzable silane containing at least one epoxy group is disclosed. The stabilizer is especially suitable as a component of a Siloxane system for coating substrates, especially thermoplastic substrates and most especially polycarbonate substrates.
摘要:
Method for coating polycarbonate moulded parts whereby, to the surface of a moulded body composed of a polycarbonate based on a cycloaliphatic diphenol, a coating material which possesses as cross-linkable components agents having acrylate, allyl, epoxide, silanol, isocyanate, anhydride, melamine functional groups or combinations thereof, is applied in a thickness of from 0.5 to 200 .mu.m and is cured thermally and/or by irradiation, with the addition of thermally or photochemically curing catalysts being possible.