Abstract:
The present invention relates to a process for preparing a substituted cellulose acetoacetate alkanoate without using a carboxamide/lithium chloride solvent system. The process involves contacting cellulose in a carboxylic acid diluent with an acetylating compound selected from the group consisting of a carboxylic acid anhydride and an acid chloride, an acetoacetylating compound selected from the group consisting of diketene, an alkyl acetoacetate and 2,2,6-trimethyl-4H-1,3-dioxin-4-one, and a mineral acid catalyst under conditions and in a molar ratio sufficient to cause the cellulose, acetylating compound and acetoacetylating compound to react to produce a substituted cellulose acetoacetate alkanoate.
Abstract:
Cellulose esters according to formula (I): [(C6H7O2)(OR)x(OR')y(OH)3-x-y]n are described, where R is hydrophobic, R' is hydrophilic and not phthalyl or trimellityl, which may be designed, by the proper selection of R, R', x, y, and n, to dissolve under mild to alkaline conditions, and not before. A coating comprising a modified ester according to formula (I) may be used for controlled-release applications, particularly for a cleaning formulation.
Abstract translation:描述根据式(I)的纤维素酯:[(C 6 H 7 O 2)(OR)x(OR')y(OH)3-xy] n,其中R是疏水性的,R'是亲水性的而不是邻苯二甲酰基或偏苯三酸 通过适当选择R,R',x,y和n来设计,在轻度至碱性条件下溶解,而不是之前溶解。 包含根据式(I)的改性酯的涂层可用于控制释放应用,特别是用于清洁制剂。
Abstract:
Disclosed is a process for the preparation of acetaldehyde by the hydrogenation of ketene in the presence of a transition metal hydrogenation catalyst.
Abstract:
A method for treating cellulose with cellulose ester for use in various paper products involves reacting cellulose and an acid anhydride to form a cellulose ester-carboxylic acid solution. Acetic anhydride may be used as the acid anhydride, and a cellulose acetate-acetic acid solution may be formed as the resulting cellulose ester-acetic acid solution. The cellulose acetate-acetic acid solution is diluted in a mixer, with additional acetic acid. Bulk cellulose is milled into cellulose fibers, and the diluted cellulose acetate-acetic acid solution diluted is combined with the cellulose fibers to achieve a treated fiber. Excess cellulose acetate-acetic acid solution is removed from the treated fiber and recycled to the mixer used in dilution. The treated fiber is water-washed by removing water from the washed treated fiber. This product can then be used in papermaking to produce a sheet for circuit boards, laminated products, and various paper products.
Abstract:
This invention relates to a composite structure having a porous surface and a multilayer film laminated to the porous surface. The multilayer film comprises a copolyester layer and a polymer layer wherein the copolyester layer is positioned between the substrate and the polymer layer. The polymer layer has a Rockwell Hardness value as determined by ASTM Method D785 of greater than or equal to R90. The composite structure is useful for interior or exterior applications, particularly as a re-usable concrete form board.
Abstract:
A process for the preparation of a 1,2-diacetoxy ester comprises acetylation of an epoxide with an acetic anhydride in the presence of a quaternary phosphonium acetate catalyst or its complex with acetic acid.
Abstract:
In a process for analyzing a sample of unknown constitution by an analytical apparatus, a set of analytical measurements and a set of reference measurements, each comprising a set of multivariate signal responses obtained from a set of samples by a first and a second analytical apparatus, are adjusted to remove operational variabilities associated with the apparatus, thereby providing a first and a second matrix of adjusted signal responses. One of the two matrices of adjusted signal responses is decomposed into a matrix product of a matrix comprising a set of principal factors and a matrix comprising the amounts associated with each of the principal factors. A compressed signal response matrix product is constructed that comprises a matrix comprising a subset of the set of principal factors and a matrix comprising the amounts associated with each of the principal factors included in the subset. From the latter matrix a projection matrix is computed. Using this projection matrix and a first normalized matrix product that comprises a normalization matrix and the other of the two matrices of adjusted signal responses, a compressed normalized matrix product is constructed. Values of the normalization matrix that minimize the difference between the first normalized matrix product and the compressed normalized matrix product are computed, thereby producing an optimal normalization matrix. A second normalized matrix product comprising the optimal normalization matrix and the one matrix of adjusted signal responses that had been decomposed into a matrix product is constructed. Using the other matrix of adjusted signal responses and the second normalized matrix product, a calibration useful for analyzing the signal responses obtained from the sample of unknown constitution by the first analytical apparatus is constructed and applied to the signal responses from the sample to determine its constitution.
Abstract:
This invention provides the preparation of water-dispersible polyester/acrylic hybrids via a two-stage emulsion polymerization process. For example, methacrylic acid and/or 2-hydroxyethyl methacrylate are copolymerized with styrene/acrylic monomers to yield a relatively hydrophilic and hydro-plasticized first stage. Subsequent additions of hydrophobic monomers to this first stage "seed" result in an inversion of the latex such that the more hydrophilic first stage is at the particle surface. This results not only in improved stability of the resulting latex without the use of additional surfactants, as evidenced by the production of reduced amounts of coagulum, while it also offers relatively low minimum filming temperatures due to the hydroplasticization of the shell of the particle. Furthermore, the use of the water-dispersible polyester results in extremely fine latex particle sizes which can significantly enhance coating properties such as film gloss and clarity.
Abstract:
The present invention provides a process for preparing N-(3-amino-4-chlorophenyl) acylamides of Formula (I): comprising reacting, in a solvent comprising at least one polar solvent, in the presence of at least one acid acceptor, 1-chloro-2,4-diaminobenzene with at least one acyl chloride of formula (II): Cl-X-R wherein X is -CO- or -SO2-; R is selected from the group C1-C25 alkyl; C1-C25 alkyl substituted with one or more groups selected from C1-C12 alkoxy, aryl, aryloxy and C5-C7 cycloalkyl; aryl; C5-C7 cycloalkyl. The present invention further comprises the step of purifying said N-(3-amino-4-chlorophenyl) acylamides by crystallizing from a non-polar solvent or conducting the reaction in a mixture of at least one polar and at least one non-polar solvent.
Abstract:
Disclosed is a process for the preparation of an aliphatic carbonyl derivative compound having a normal:iso ratio of at least 3, and preferably 4, selected from aliphatic carboxylic acids, alkylesters of aliphatic carboxylic acids and anhydrides of aliphatic carboxylic acids by the hydrocarboxylation of terminal linear olefins in the presence of a catalyst system comprising (1) a rhodium containing compound, (2) a halide promoter selected from iodine, bromine and compounds thereof and (3) a trisubstituted organic compound of a group-15 element, preferably a phosphine or arsine. This process constitutes an improvement over known processes since it provides a one-step, lower pressure, higher reaction rate method of producing carboxylic acid derivatives having an increased normal:iso ratio in the absence of potentially hazardous chlorinated hydrocarbons and aromatic hydrocarbons.