摘要:
This invention provides a new, biomass-derived glycol, bis(2-hydroxyethyl)isosorbide, which is found to be a valuable monomer for a wide variety of polymeric materials.
摘要:
This invention pertains to a process for making &agr;-methylenelactones and &agr;-substitute hydrocarbylidene lactones. More specifically, the present invention obtains high yields of &agr;-methylene-&ggr;-butyrolactone by heating &ggr;-butyrolactone and diethyl oxalate in the presence of a base. The second step comprises treatment of the &agr;-oxalyl enolate salt with formaldehyde to afford the &agr;-methylene-&ggr;-butyrolactone.
摘要:
This invention relates to composite materials for restorative dentistry. More particularly, it relates to new components for dental composites, which impart an attractive combination of good mechanical properties and low shrinkage.
摘要:
The present invention relates to an improved process to prepare cis-3-dihydrocarbylmethano-5-hydrocarbyidihydro-furan-2-ones. The present invention also relates to novel compositions of matter comprising enantiomerically pure cis-3-dihydrocarbylmethano-5-hydrocarbyldihydro-furan-2-ones, being the (3S,5S), (3R,5R), (3S,5R), or (3R,5S) optically pure isomers, and a new, more cost efficient process to prepare said optically pure isomers.
摘要:
The invention relates to (meth)acrylate monomers derived from polyfunctional nucleus molecules; the invention further relates to a dental composite material wherein (meth)acrylate monomers are utilized to reduce shrinkage upon polymerization; the invention also relates to a method for producing dental restoration articles with reduced shrinkage; the invention also relates to various dental restorative articles comprising the aforementioned (meth)acrylate monomers.
摘要:
The invention relates to a dental composite material wherein space-filling compounds are utilized to reduce shrinkage upon polymerization; the invention also relates to a method for producing dental restoration articles with reduced shrinkage; the invention also relates to various dental restorative articles comprising the aforementioned space-filling compounds.
摘要:
Polymers containing α-methylenelact(ones)(ams) such as α-methylenebutyrolactones are useful in blends with other polymers. For examples such polymers which have reactive groups are toughened by mixing with a rubbery material which has complimentary reactive groups, or polymers containing repeat units derived from α-methylenelact(ones)(ams) are toughened by mixing with polymeric core-shell particles having an elastomeric core and a specified thermoplastic shell. The properties of thermoplastics are also improved by blending with α-methylenelact(ones)(ams) such as α-methylenebutyrolactones containing (co)polymers.
摘要:
This invention pertains to a process for making &agr;-methylenelactones and &agr;-substituted hydrocarbylidene lactones. The present invention obtains high yields of &agr;-methylene-&ggr;-butyrolactone by heating &ggr;-butyrolactone and formaldehyde in the presence of a base.
摘要:
This invention relates to composite materials for restorative dentistry. More particularly, it relates to new components for dental composites, which impart an attractive combination of good mechanical properties and low shrinkage.