Abstract:
Polyol compositions containing urethane linkages derived from amino acids. The polyols are obtained from the reaction of the carbonate with the amines in the amino acids. Individual amino acids or mixtures of amino acids that are prepared from the hydrolysis of the proteins can be used.
Abstract:
The invention relates to an aqueous adhesive composition which comprises an unsaturated elastomer latex and a phenol-aldehyde resin consisting of at least: an aromatic polyaldehyde having at least two aldehyde functions, including at least one aromatic ring; a polyphenol comprising at least one aromatic ring: in the event of a single aromatic ring, the latter has two or three hydroxyl functions in meta position relative to one another or relative to each other. The rest of the ring is non-substituted. In the event of a plurality of aromatic rings, at least two of same each have two or three hydroxyl functions in meta position relative to one another or relative to each other. The two ortho positions of at least one of said hydroxyl functions are non-substituted. The weight ratio of polyphenol to polyaldehyde is no lower than 3.0.
Abstract:
The present invention relates to methods for the production of a resin such as a thermosetting resin, particularly a bioresin, components for use in the methods, and products obtained from the methods. In one aspect the method of forming a resin comprising the steps of: (1 ) providing an aldehyde-cross-linking agent condensate obtained by reacting a volatile aldehyde with a cross-linking agent; (2) providing a non-volatile aldehyde; and (3) combining the aldehyde- cross-linking agent condensate and the non-volatile aldehyde, thereby forming the resin.
Abstract:
The present invention provides biodegradable particles (e.g., three-dimensional particles) and micelles which can be used to encapsulate active agents for delivering to a subject. The present invention further provides methods for producing and delivering such particles and micelles. Additionally, the invention provides vaccination strategies that encompass the use of the novel particles and micelles.
Abstract:
The present invention provides biodegradable particles (e.g., three-dimensional particles) and micelles which can be used to encapsulate active agents for delivering to a subject. The present invention further provides methods for producing and delivering such particles and micelles. Additionally, the invention provides vaccination strategies that encompass the use of the novel particles and micelles.
Abstract:
Ozonolysis is a well known process involving reacting ozone with alkene compounds, for example in unsaturated vegetable oils or free fatty acids and esters thereof, to form ozonolysis products (e.g. ozonides). The invention concerns ozonolysis of unsaturated oils (e.g. unsaturated plant oils and/or unsaturated animal oils) in the presence of a participating co-reactant to form reaction products particularly suitable for use in the formation of resins.
Abstract:
This invention concerns a process for the copolymerization of formaldehyde with cyclic ethers, the process comprising combining in a hydrocarbon solvent a cyclic ether, a cationic initiator comprising an anion formed from tetraphenyl borate derivatives, and mixtures thereof, and a cation, and anhydrous formaldehyde. These initiators provide high activity, high cyclic ether incorporation rates, and stability while minimizing the production of by-products.
Abstract:
The present invention relates to biodegradable biocompatible polyacetals, methods for their preparation, and methods for treating mammals by administration of biodegradable biocompatible polyacetals. A method for forming the biodegradable biocompatible polyacetals combines a glycol-specific oxidizing agent with a polysaccharide to form an aldehyde intermediate which is combined with a reducing agent to form the biodegradable biocompatible polyacetal. The resultant biodegradable biocompatible polyacetals can be chemically modified to incorporate additional hydrophilic moieties. A method for treating mammals includes the administration of the biodegradable biocompatible polyacetal in which biologically active compounds or diagnostic labels can be disposed.
Abstract:
This invention pertains to perfluoropolyethers and perhalogenated chlorofluoroether polymers that can be prepared by fluorinating polymers made by the polymerization of acetals, ketals, polyacetals, polyketals and orthoesters with elemental fluorine.