Abstract:
There are provided polymer bound hindered amine light stabilizers with recurring units selected from or both in which the units occur, e.g., in the polymer backbone and wherein R¹ and R² are, e.g., hydrogen or alkyl of 1 to 6 carbons, x is an integer of 0 or 1, and G has the structure wherein X is, e.g., -Z-C(=O)-R⁹-C(=O)-N(R⁸)- where Z is, e.g., -N(R¹⁰)-, R⁹ is, e.g., a direct bond and R⁴, R⁵, R⁶, R⁸ and R¹⁰ are, e.g., hydrogen. They are prepared by reacting hindered amine light stabilizers containing reactive hydrazide functionalities with anhydride containing polymers or copolymers. The reactions may be carried out in an inert solvent or in a melt blending step. The polymer bound hindered amine light stabilizers are useful alone or may also be used to stabilize other polymers, copolymers or polymer blends against the deleterious effects of heat and/or light.
Abstract:
These are provided polymer bound stabilizers with recurring units selected from the formulas or both wherein the units occur, e.g., in the polymer backbone, x is 0 or 1, R¹ and R² are, e.g., hydrogen, and each - -
is the residue of a primary amino or hydrazido substituted stabilizer group selected from (a) hindered phenols, (b) hindered amine light stabilizers, (c) 2-hydroxybenzophenones, (d) 2-(2-hydroxyphenyl)-2H-benzotriazoles, (e) secondary aromatic amines, (f) benzothiazoles or benzimidazoles, (g) aryl salicylates, (h) salicylic acid derivatives (i) oxamide derivatives and (j) dialkyl sulfides, with the proviso that at least two different groups from (a) through (j) are attahced to the polymer. The polymeric stabilizers are prepared by the reaction of primary amino or hydrazido substituted stabilizers with some or all of the anhydride groups of the polymer or copolymer. They are not lost from the polymer by volatilization, migration or extraction, even at high temperature and may be used as concentrates to stabilize other polymers.
Abstract:
This invention relates to a compound having the formula: wherein R¹, R², R³ and R⁴ are, e.g., alkyl of 1 to 10 carbons or hydroxy, X is, e.g., -O- or -S-, R⁵ is, e.g., alkylene of 1 to 10 carbons or alkenylene of 2 to 10 carbons, Y is, e.g., -C(=O)- or -S(=O)₂-, R⁶ is, e.g., hydrogen or alkyl of 1 to 10 carbons,
R¹² is, e.g., alkylene of 2 to 5 carbons or alkenylene of 2 to 3 carbons and n is 1 or 2, which compound incorporates both o-hydroxybenzophenone and hydrazide functional groups. Such compounds are useful as ultraviolet light absorbers and heat stabilizers for plastics.
Abstract:
There are provided reactive hindered amine light stabilizers of the formula wherein
R is e.g., hydrogen, hydroxyl or alkyl of 1 to 20 carbons; R 1 is, hydrogen or lower alkyl of 1 to 4 carbons; R 2 is, e.g., hydrogen or alkyl of 1 to 20 carbons; R 3 is, e.g., a direct bond or an alkylene or branched alkylene diradical of 1 to 14 carbons; and R 4 is, e.g., hydrogen or a primary or secondary alkyl group of 1 to 8 carbons, containing a light stabilizing group, a heat stabilizing group, and a reactive hydrazide functionality in the same molecule. The reactive stabilizers are prepared by reacting 4-amino-2,2,6,6-tetraalkylpiperidines with diesters (or mono ester acid chlorides) of dicarboxylic acids followed by hydrazinolysis of the ester group of the intermediate mono ester-amide. The compounds are useful for introducing permanent heat and light stability to coreactive polymers or copolymers.
Abstract translation:提供式CHEM的反应性受阻胺光稳定剂,其中R为例如氢,羟基或1-20个碳的烷基; R 1是氢或1至4个碳的低级烷基; R 2是例如氢或1至20个碳的烷基; R 3是例如直接键或1至14个碳的亚烷基或支链亚烷基二碱基; 并且R 4是例如在相同分子中含有光稳定基团,热稳定基团和反应性酰肼官能团的氢或1至8个碳原子或仲烷基。 反应性稳定剂通过4-氨基-2,2,6,6-四烷基哌啶与二羧酸的二酯(或单酯酰氯)反应,然后通过中间体单酯 - 酰胺的酯基进行肼解来制备。 该化合物可用于将热稳定性和光稳定性引入聚合物或共聚物。
Abstract:
A composition, useful for dissolving sulfur, comprising a disulfide, polysulfide and mixtures thereof containing a catalytic amount of a mixture of a basic nitrogen-containing compound and an alcoholic or aqueous solution of an alkali hydroxide, alkoxide, or carbonate and methods for using the composition to prevent sulfur-plugging in a system, are disclosed.
Abstract:
A process is provided for the free radical polymerization of monomers derived from substituted or unsubstituted acrylic acid/methacrylic acid and esters thereof for the production of a polymer having a narrow molecular weight distribution and an average molecular weight of less than 4000. These polymers are produced by the solution polymerizing of said monomers wherein 20-40% by weight of the monomer composition is hydroxyalkyl acrylate or methacrylate in the presence of a solvent system suitable for high solids coating applications and in the presence of an initiating amount of a tertiary alkyl hydroperoxide and/or its derivatives having at least 5 carbons wherein the initiator and monomers, alone or in combination, are added continuously at a programmed rate wherein the rate of addition corresponds approximately to the rate of decomposition of said monomer and initiator. These polymers are used for high solids coating applications.
Abstract:
An improved process is provided for preparing stable low viscosity polymer-polyols containing less than about 100 ppm residual monomers by using a monoperoxycarbonate initiator in combination with at least one initiator selected from diperoxyketals and peroxyesters, as chaser catalysts, at or near the end of the polymerization. The polymer-polyols prepared by the instant invention can be used to prepare high resiliency (load bearing) polyurethane foams.
Abstract:
A process for preventing odor-fading of liquefied petroleum gas odorized with organosulfur compounds wherein the gas is stored in containers having new or recently cleaned interior surfaces, such surfaces having been pretreated with benzotriazole, tolyl triazole, mercaptobenzothiazole, benzothiazyl disulfide or mixtures thereof.
Abstract:
Waste water from the preparation of salts of dithiocarbamic acid is detoxified by acidifying the waste water to promote hydrolytic decomposition of organosulfur compounds, passing an inert gas through the acidified water to aid in expelling decomposition gases thereby increasing the decomposition rate, and optionally, adjusting the pH of the resulting solution toward neutral.
Abstract:
The process for preparing aliphatic and aromatic amines by reacting an olefin with either ammonia, a primary amine, or a secondary amine at elevated temperature in the presence of an ammonium halide catalyst, preferably a catalyst-promoter combination, is disclosed herein.