摘要:
A process for producing PTMEA with low color number wherein, after the polymerization of THF, the recovery of the PTMEA product involves the vaporization at nearly atmospheric pressure of unreacted THF followed by stripping of the residual THF, carboxylic acid and carboxylic anhydride in two consecutive stages of stripping, the first one using as stripping medium a mixture of nitrogen, hydrogen and THF, the second one using as stripping medium a mixture of nitrogen and hydrogen with minimum THF content.
摘要:
Implementations described herein relate to an etheramine mixture containing a cyclobutane based amine and its method of production by alkoxylating an initiator with an alkylene oxide to produce a precursor polyol and reductively aminating the precursor polyol to form the ehteramine mixture. The etheramine mixture may be used in a variety of applications including as a curing agent for an epoxy resin or as a reactant in the production of polyurea materials.
摘要:
본 발명은 환원성 아민화 반응용 촉매 및 이의 용도에 관한 것이다. 본 발명에 따른 촉매는 기본적으로 탈수소화 및 수소화 반응에 대한 밸런스를 유지할 수 있으면서도, 특히 수분의 존재 하에서도 촉매 활성이 유지될 수 있어 높은 아민 전환율을 나타낼 수 있다. 그에 따라, 상기 촉매는 환원성 아민화를 통한 폴리에테르아민 화합물의 연속식 제조 공정뿐 아니라, 배치식 제조 공정에서도 수분의 존재 여부와 관계없이 유용하게 이용될 수 있다.
摘要:
End-capped polymers, methods for making those end-capped polymers, compositions containing those end-capped polymers, and methods for using those compositions are disclosed. One of the disclosed end-capped copolymers has the formula (I): and may be combined with natural or synthetic bone minerals, bone tissue, collagen tissue, bone protein or combinations or derivatives of those materials to form a tissue repair composition.
摘要:
End-capped polymers, methods for making those end-capped polymers and compositions containing those end-capped polymers are disclosed. One of the disclosed end-capped copolymers has the formula (I) and may be combined with demineralized bone particles to form a tissue repair composition.
摘要:
Disclosed are novel polyether compounds obtained by the reaction of polymerisation of 3,4-epoxy-1-butene in the presence of tetrahydrofuran, an acidic catalyst and a nucleophilic initiator compound. The polyether compounds comprise m units of residue (1), n units of residue (2), and p units of residue (3) wherein (i) residues (1), (2) and (3) have the structures (1), (2): -O-CH2-CH=CH-CH2-, and (3): -O-CH2-CH2-CH2-CH2-, (ii) the total value of m+n+p is 5 to 70; (iii) the value of n/(m+n+p) is in the range of 0.2 to 0.4, i.e., residue (2) constitutes from 20 to 40 mole percent of the total moles of residues (1), (2) and (3); and (iv) at least 98 percent of the terminal groups have the structure (4) or (5): HO-CH2-CH=CH-CH2-.
摘要:
Disclosed are novel saturated polyether compounds comprised of n units of residue (1) and m units of residue (2), wherein (i) residues (1) and (2) have the structures (1) and (2); (ii) the total value of n + m is 2 to 70 and m/(n + m) is 0.05 to 0.98; (ii) at least 98 percent of the terminal hydroxyl groups of the polyether have the structure (3) or (4). The polyethers are obtained by first polymerizing 3,4-epoxy-1-butene to produce unsaturated polyether precursors comprising residues (1A) and (2A) having the structures (1A) and (2A), and then hydrogenating the unsaturated polyether precursors. The hydrogenation advantageously is performed in the presence of a nickel hydrogenation catalyst.