摘要:
A crosslinking additive for imparting water resistance to starch-based alkaline corrugating adhesive compositions is prepared by reacting acetone and formaldehyde under aqueous alkaline conditions at 20.degree.-80.degree. C. in a molar ratio of from 2 to 5 moles of formaldehyde per mole of acetone. The condensate is thereafter treated with from 1.0 to 2.0 moles of hydrogen peroxide per mole of unreacted formaldehyde which oxidizes the residual formaldehyde to formic acid. The treated crosslinking additive will contain less than 0.4% unreacted formaldehyde and may be added directly to a starch-based corrugating adhesive.
摘要:
A method of making a fiber optic connector sub-assembly involves: initially disposing a bonding agent in a ferrule bore of a ferrule; heating at least a portion of the ferrule above a melting temperature of the bonding agent so that some of the bonding agent melts; and solidifying the bonding agent that has melted to form the fiber optic connector sub-assembly, all without an optical fiber being disposed within the ferrule bore.
摘要:
We disclose methods and compositions for preparation of stimuli-responsive plastics that are capable of responding to chemical and/or physical signals in their environment. In one embodiment the plastics consist of patterned mixtures of poly(phthalaldehyde) polymers in which each polymer contains a different end-capping group (also called a “trigger”), responsive to a different signal. Other embodiments use different polymers and different triggers. The plastics may be homogeneous in composition, but each polymer within the plastic is capable of responding to a different signal and depolymerizing once this signal reacts with the trigger. This process of depolymerization enables the plastic to alter its physical features non-linearly to external signals: i.e., the degree of change in physical form is much larger than the intensity of the initial signal.
摘要:
PRESSURE-SENSITIVE SOLVENT RESISTANT ADHESIVES ARE DISCLOSED WHICH CONSISTS ESSENTIALLY OF AN EPIHALOHYDRIN POLYMER AND A THERMOPLASTIC POLYKETONE RESIN COMPRISING THE CONDENSATION PRODUCT OF AN ALIPHATIC KETONE HAVING A TOTAL OF 3 TO 6 CARBON ATOMS; A MONOARYL ALKYL KETONE HAVING FROM 6 TO 10 RING CARBON ATOMS IN THE ARYL GROUP AND FROM 1 TO 4 CARBON ATOMS IN THE ALKYL GROUP; AND ALIPHATIC KETONE HAVING A TOTAL OF 3 TO 6 CARBON ATOMS WITH A LOWER ALIPHATIC ALDEHYDE, A MONOARYL ALKYL KETONE HAVING FROM 6 TO 10 RING CARBON ATOMS IN THE ARYL GROUP AND FROM 1 TO 4 CARBON ATOMS IN THE ALKYL GROUP WITH A LOWER ALIPHATIC ALDEHYDE; OR A CARBOCYCLIC KETONE HAVING 3 TO 7 RING CARBON ATOMS WITH A LOWER ALIPHATIC ALDEHYDE.
摘要:
Carbon-linked 5-hydroxymethylfurfural (HMF) oligomers contain at least one first HMF unit and one second HMF unit. The first and second HMF units are linked by a carbon-carbon bond with involvement of an aromatically bound carbon atom at position 3 or 4 of the furan ring of the first HMF unit. The HMF oligomers may be used as reactive carbonyl compounds in the manufacture of thermally curable resins on the basis of phenolic compounds and/or aminoplastic forming agents as well as in the manufacture of wood composite products.
摘要:
A method of making a fiber optic connector sub-assembly involves: initially disposing a bonding agent in a ferrule bore of a ferrule; heating at least a portion of the ferrule above a melting temperature of the bonding agent so that some of the bonding agent melts; and solidifying the bonding agent that has melted to form the fiber optic connector sub-assembly, all without an optical fiber being disposed within the ferrule bore.