摘要:
A polyfunctional amine is reacted with both a polycarboxylic acid and a monocarboxylic acid to form relatively short chain polyamides in the molecular weight range from about 400 to about 2500, which are substantially linear and which have at least one carboxy group remaining on the majority of molecules, which permits a thermoplastic resin to be formed which is extremely friable and grindable, at the same time making it a durable and desirable matrix for incorporating dyes, particularly fluorescent dyes, to form a pigment characterized by exceptionally high heat stability. Light stability is also improved with some fluorescent dyes. Optionally, an epoxy resin may be included in the cocondensate, maintaining at least one carboxy group on most molecules of the co-condensate, without altering the thermoplastic nature of the resin. Alternatively, the monocarboxylic acid may be omitted, forming a modified polyamide with a polyfunctional amine and a polycarboxylic acid. Optionally, whether or not a monocarboxylic acid is used, a sufficient amount of stabilizing compound of an element from Groups IIA and IIB may be added to further stabilize the pigment.
摘要:
The present invention provides a process in which a slurry is prepared containing optical brighteners from the distilbene, pyrazoline, coumarine and triazolyl-stilbene series, by mixing the wet filter-cake obtained during the preparation of these compounds with such quantity dispersing agent and/or electrolyte that the resultant slurry is thixotropic and, therefore, has reduced tendency to settle out on static storage and has a Brookfield viscosity at equilibrium from 2,000 to 10,000 centipoise at 6 revolutions per minute, 1,000 to 3,500 centipoise at 12 revolutions per minute and up to 2,000 centipoise at 60 revolutions per minute.
摘要:
An aqueous latex coating composition adapted to deposit films which dry to form a cellular layer of high opacity and brightness is provided by swelling the resin particles of the aqueous latex with a primary organic solvent which is essentially immiscible in the aqueous phase of the latex, such as xylene, and by introducing into the aqueous phase an at least partially water miscible organic solvent, such as propylene glycol, having a lower evaporation rate and a lesser capacity for solvating the resin of the latex than said primary solvent. When the primary solvent evaporates, a cellular film is formed, the secondary solvent serving to increase the opacification which is obtained. An optical brightener or fluorescent agent is incorporated by dissolving it in the primary organic solvent to thereby become incorporated within the polymeric material of the cellular film to create added brightness and bolder color when the films are irradiated with ultraviolet-containing light.
摘要:
A process for the non-aqueous optical brightening of organic fibre material, especially fibre material made from cellulose, natural or synthetic polyamide, by the exhaustion method, is disclosed, which comprises treating said fibre material in the solution of at least one optical brightener salt consisting of the anionic radical of an anionic optical brightener and at least one cationic radical of an inorganic or organic base, said organic base being derived from an organic nitrogen compound containing at least one nitrogen atom capable of salt formation, in a solvent mixture consisting of unsubstituted or halogenated hydrocarbon boiling between 50* and 150*C and liquid, water soluble organic solvent boiling below 220*, at a temperature between room temperature and the boiling point of the solvent mixture, optionally under pressure, and finishing the brightened fibre material in the usual manner. By this process, excellent white-effects or brightenings having good fastness properties, such as fastness to dry cleaning and washing, are obtained on said fibre material, without any subsequent heat treatment such as steaming or thermofixing.
摘要:
Sized particles of inert carrier material are coated, by means of dry mixing, with smaller particles of daylight fluorescent pigment. The pigment particles adhere tightly to the carrier particles to form a material which is useful in producing signalling and marking clouds.