摘要:
Use of hypochlorous acid as the treating agent in the bonding of cured elastomer and polyurethanelpolyurea increases adhesion. The process is useful for repairing damaged articles of cured elastomer and also for bonding together layers of cured elastomer.
摘要:
The invention provides a shaped article of a fluorine-containing synthetic resin having improved surface properties such as increased wettability with water, printability, susceptibility to adhesive bonding and less accumulation of static electricity. The improved shaped article is obtained by subjecting the surface of the article to exposure to low temperature plasma generated in a low pressure atmosphere of a nitrogen-containing gaseous organic compound such as amines, imides and amides.
摘要:
A shaped article, such as film or fiber, of an aromatic polyamide is provided. The shaped article is prepared by incorporating in an aromatic polyamide 0.5-30 wt. %, based on the aromatic polyamide, of a silicone compound such as a compound of the formula: X'Si(OR') 3 (wherein R' is alkyl and X' is an organic functional group), and then, treating the resulting polymer composition with heat, ultraviolet rays and/or electron beams. in addition to the silicone compound, a minor amount of a specified crosslinking compound may be incorporated in the aromatic polyamide. The shaped article exhibits improved heat resistance, electric characteristics and dimentional stability.
摘要:
The present application relates to enclosure members consisting essentially of solid, non-aromatic polymers that have a linear carbon to carbon backbone structure and having a plurality of free hydrogen atoms attached to the carbon atoms with a permeability to wet solvents and fuels of less than 1/50, optionally less than 1/200 of the permeability of untreated enclosure members having a thickness of 1 mm. Said low permeability is due to the presence of a coating on at least the inner surface of said enclosure members, having a portion of the hydrogen atoms replaced by sulphonic acid or sulphonate groups, consisting of a cured thin layer (of at least 2 µm) of condensation products of formaldehyde and melamine of formaldehyde and urea. Evidently the application relates also to a method of preparing said enclosure members.
摘要:
A surface-metallized, moulded resin article comprises a polymer or a composition thereof, said polymer being capable of the melt-processing and forming the anisotropic phase in the molten state, that is, a liquid crystal polymer, and a metal coating thereon. It is durable at high temperatures in its dimension and the coating.
摘要:
Plastic containers are treated to provide increased barrier properties to organics and gases such as oxygen by treating the interior surface of the container with SO 3 gas. The SO 3 gas is provided by inserting a solid pellet of poly-SO 3 into the container and evaporating the S0 3 such as with microwave energy. A solid neutralizing agent such as ammonium carbonate is then placed into the container and evaporated with microwave energy to form ammonia which neutralizes the sulfonic acid groups on the surface interior of the container.
摘要:
There is disclosed an antithrombogenic polyurethane polymer which comprises: a polyurethane substrate; a polymeric amine covalently bonded to the polyurethane substrate; and an antithrombogenic agent wherein the polymeric amine is chosen from: a polyvinyl amine, a polyalkylenimine which has 2, 3 or 4 carbon atoms per amine unit, and mixtures thereof. A process for imparting antithrombogenic activity to a polyurethane substrate is also disclosed.
摘要:
A method of preparing a composite of polyurethane bonded to the surface of a cured rubber substrate and the resulting composite. The method is comprised of first applying to a cleaned, cured rubber surface a coating of cyanuric acid followed by an additional coating of a phenol formaldehyde resin and then appying a liquid polyurethane reaction mixture which is cured to form the resultant composite. The invention is particularly directed to the preparation of a tire comprised of a polyurethane carcass applied to a cured rubber tread and to a tire comprised of a polyurethane tread applied to a cured rubber carcass.
摘要:
Disclosed herein is a thin transparent polytetrafluoroethylene film defined as follows: (1) a film thickness of 0.1-100 µm; (2) a parallel light transmittance of at least 70% (as measured in accordance with JIS K 7105); and (3) a tensile strength of at least 1 kg/mm 2 (as measured in accordance with JIS K 6887 except for the use of a pulling speed of 10 mm/min.). It is produced by fluorinating with a fluorine gas a thin film formed from a solution of a fluoroethylene polymer having an inherent viscosity of at least 2.5 dl/g (as measured at a temperature of 30°C and a solution concentration of 0.4 g/dl) in accordance with the casting process and having a thickness of 0.1-100 µm.