Abstract:
The present invention relates to a water-based epoxy composition, and to a water-based epoxy resin composition which is able to contain a large amount of water because it uses an epoxy resin and a coagulant and thereby allows an emulsifier and water to be stably adsorbed and captured on tangled particle surfaces of the coagulant. The water-based epoxy composition according to the present invention comprises a highly compatible formulation producing a good crosslinking bond in a curing reaction with a curing agent and hence it can effect functions including those of a coating agent, primer agent, mortar agent and adhesive agent in a two-part formulation, and it entails a formulation using absolutely no volatile organic compounds in large amounts as is the case with prior-art epoxy resin compositions and hence it is environmentally friendly and can also markedly reduce production costs.
Abstract:
An absorbable PEG-based hydrogel prepared from a multi-arm-PEG-vinylsulfone having about 3 to about 8 arms and a multi-arm-PEG-R-sulfhydryl having about 3 to about 8 arms; where R is defined as an ester linkage, such as carboxylate ester, lactate ester, and isobutyrate ester have been disclosed. Additionally, sustained release compositions that are prepared from an absorbable PEG-based hydrogel and a protein have been disclosed which provide sustained release of proteins and peptides.
Abstract:
A well treatment composition for use in a hydrocarbon-bearing reservoir comprising a reversible aminal gel composition is disclosed. The reversible aminal gel composition includes a liquid precursor composition. The liquid precursor composition is operable to remain in a liquid state at about room temperature. The liquid precursor composition comprises an organic amine composition; an aldehyde composition; a polar aprotic organic solvent; and a metal salt composition with valence 3, 4, or 5. The liquid precursor composition transitions from the liquid state to a gel state responsive to an increase in temperature in the hydrocarbon-bearing reservoir. The gel state is stable in the hydrocarbon- bearing reservoir at a temperature similar to a temperature of the hydrocarbon-bearing reservoir, and the gel state is operable to return to the liquid state responsive to a change in the hydrocarbon-bearing reservoir selected from the group consisting of: a decrease in pH in the hydrocarbon-bearing reservoir and an addition of excess metal salt composition in the hydrocarbon-bearing reservoir.
Abstract:
The mechanical properties of urea formaldehyde resins may be improved by incorporating therein polyvinyl alcohol. The polyvinyl alcohol may be incorporated during pre-mixing, mid mixing, and/or post mixing of the resin components. Resins prepared using polyvinyl alcohol are particularly desirable in articles requiring improved mechanical strength and water resistance, as compared to similar resins prepared without the polyvinyl alcohol such as shingles.
Abstract:
The present invention relates to a water-soluble carbohydrate-polyamino acid-based pre-reacted binder composition,a method of its manufacture, use of the pre-reacted binder composition, a method of manufacturing a collection of matter bound by a polymeric binder, a binder solution or dispersion comprising the pre-reacted binder composition, as well as products comprising the pre-reacted binder composition in a cured state.
Abstract:
The present invention concerns the use of a furfural derivative of formula (I) in which R represents (i) a -CH=CR'1-COR1 group, a group (ii), a group (iii), a group (iv) or a -CHO group and R' represents a hydrogen atom or a (C1-C4)alkyl group, as a chemical vehicle, as a solvent, co-solvent, coalescing agent, crystallisation inhibitor, plasticising agent, degreasing agent, etchant, cleaning agent or agent for increasing biological activity, and more particularly as a solvent. It also concerns phytosanitary formulations or resin-solubilising formulations comprising at least one such furfural derivative of formula (I).