摘要:
The present invention relates to a particulate superabsorbent polymer composition comprising a polymer comprising a neutralized aluminum salt solution applied to the surface of a particulate superabsorbent polymer; wherein an aqueous solution of the neutralized aluminum salt has a pH value from about 5.5 to about 8 and the particulate superabsorbent polymer composition has a mean particle size distribution of from 300 to 400μm, an original Free Swell Gel Bed Permeability (FSGBP) of about 20x10 -8 cm 2 to about 200x10 -8 cm 2 ; and subsequent to subjecting the particulate superabsorbent polymer composition to the Processing Test, the particulate superabsorbent polymer composition has a permeability stability index of from about 0.60 to about 0.99 and having particles having a particle diameter of larger than 600μm in an amount of less than about 15wt% of the particulate superabsorbent polymer composition and as specified by standard sieve classification.
摘要翻译:本发明涉及一种颗粒状超吸收性聚合物组合物,其包含聚合物,该聚合物包含施加到颗粒状超吸收性聚合物表面上的中和的铝盐溶液; 其中中和的铝盐的水溶液的pH值为约5.5至约8,并且颗粒超吸收聚合物组合物的平均粒度分布为300至400μm,原始的自由溶胀凝胶床渗透性(FSGBP)为约20×10 -8cm 2至约200×10 -8 cm 2; 并且在使颗粒状超吸收性聚合物组合物经受加工试验之后,颗粒状超吸收性聚合物组合物的渗透性稳定性指数为约0.60至约0.99,并且具有小于约15重量%的粒径大于600μm的颗粒 %的颗粒状超吸收性聚合物组合物,并按标准筛选分类。
摘要:
The present invention relates to a crosslinkable composition crosslinkable by Real Michael Addition (RMA) reaction comprising a component with at least 2 activated unsaturated groups (hereafter referred to as the RMA acceptor groups) and a component with at least 2 acidic protons C-H in activated methylene or methine groups (hereafter referred to as the RMA donor groups) which components can react to form a crosslinked network. The composition comprises: f. Component(s) A having at least 2 acidic C-H donor groups in activated methylene or methine and having a pKa(A) between 10.5 and 14; g. Component(s) B having at least 2 activated unsaturated acceptor groups, wherein a molar ratio R of acceptor groups to donor groups is between 3:1 to 1:6 and which component(s) B react with component(s) A by Real Michael Addition (RMA) to form a crosslinked network; h. basic component(s) C being a salt of a basic anion X- from an acidic X-H group containing compound wherein X is N, P, O, S or C: iv. in an amount xc between 0.001 and 1 meq/(gr of components A, B, C, D), v. anion X- being a Michael Addition donor reactable with component B and vi. anion X- is characterized by a pKa(C) of the corresponding acid X-H of more than two units lower than the pKa(A) of the majority component A and being lower than 10.5; i. optional component(s) D comprising one or more acidic X'-H groups wherein X' is N, P, O, S or C: v. X' being a same or different group as group X in component C, vi. the X'- anion being a Michael Addition donor reactable with component B, vii. the pKa(D) of the X'-H group in component D being more than two units lower than pKa(A) of the majority component A and being lower than 10.5, viii. the equivalent ratio Rd/c of acidic X'-H groups in component D over basic anion X- in component C is between 1% and 5000%.
摘要:
본 발명은 고흡수성 수지의 제조 방법에 관한 것이다. 본 발명의 고흡수성 수지의 제조 방법은 수용성 에틸렌계 불포화 단량체 및 중합개시제를 포함하는 모노머 조성물에 열중합 또는 광중합을 진행하여 제 1 중합체를 형성하는 단계; 수용성 에틸렌계 불포화 단량체 및 중합개시제를 포함하는 모노머 조성물에 열중합 또는 광중합을 진행하여 제 2 중합체를 형성하는 단계; 상기 제 1 중합체를 건조하는 단계; 건조된 상기 제 1 중합체를 분쇄하는 단계; 및 분쇄된 상기 제 1 중합체와, 가교제 용액으로 자유 팽윤시킨 제 2 중합체를 혼합하여 상기 제 1 중합체 및 제 2 중합체에 대해 가교 반응시키는 단계를 포함한다. 본 발명에 따르면, 높은 보수능 및 가압 흡수능을 갖는 고흡수성 수지를 수득할 수 있다.
摘要:
A process for the manufacture of a modified poly(alkylene carbonate) comprising compounding i) at least one poly(alkylene carbonate) and at least one modifying agent having at least three carboxylic acid groups, or ii) at least one carboxylic acid group and at least one anhydride group, or iii) at least two anhydride groups, at a temperature of 120 to 240°C.
摘要:
Systems and methods for separation or isolation of technetium radioisotopes from aqueous solutions of radioactive or non-radioactive molybdate salts using a polyalkyl glycol-based cross-linked polyether polymer. Some embodiments can be used for the effective purification of radioactive technetium-99m produced from low specific activity 99 Mo.
摘要:
Polymer network composition comprising a semi-crystalline covalently crosslinked polymer network including exchangeable covalent bonds and crosslinking bonds and at least an exchange reaction catalyst, wherein the number of crosslinking bonds is sufficient for the polymer network to be beyond the gel point and the number of exchangeable bonds is sufficient for the network to relax stresses and/or flow when conditioned at an appropriate temperature. Such compositions are characterized by the fact that the network is able to reorganize by exchange reactions that allow it to relax stresses and/or flow while maintaining network connectivity.