摘要:
There are described liquid compositions of a hemiformal of phenol and/or a hemiformal of a methylolated phenol with a miscible polymers such as phenol-formaldehyde resoles, phenol-formaldehyde, novolacs, aromatic polyesters, unsaturated polyesters, poly(aryl-ethers), aromatic polycarbonates urea-formaldehyde resins, or melamine-formaldehyde resins. The compositions are useful for forming thermoset plastic materials.
摘要:
There are described composites containing from about 20 to about 70 weight percent of a reinforcing material, such as glass, carbon, graphite, or aromatic polyamide fiber, and from about 30 to about 80 weight percent of a thermosetting composition which contains hemiformals of phenol and methylolated phenol and a polymer miscible with the hemiformal.
摘要:
Disclosed are reinforced composites having a high content of reinforcing material such as glass fiber. They are made from liquid phenol-formaldehyde resoles containing a small amount of unbound water and volatile organic compounds.
摘要:
Disclosed are high-ortho phenol-formaldehyde resoles having stable hemiformal groups. These resoles are of low viscosity, are essentially free of unbound water and volatile organic compounds. They are curable to phenolic formaldehyde resinous solids and are particularly suitable for use in liquid injection molding processes to form composites.
摘要:
This invention is directed to hemi-formals having the following formulas: ##STR1## wherein b is 1 to about 5, c is 1 to about 3, d is 0 to about 2, the sum of c and d does not exceed 3 and is equal to or greater than 1 and n has a value equal to or greater than 1. These materials can be used to manufacture phenolic resins and are adaptable to liquid injection molding processes.
摘要:
Latent catalysts comprising the phenyl esters of certain carboxylic acids are disclosed for use in the cure thermosetting resins curable by an acid catalyst.
摘要:
Latent catalysts comprising certain sulfur dioxide containing compounds such as bubadiene sulfone are used in the cure of thermosetting resins which are curable by an acid catalyst.
摘要:
A process for the water-in-oil emulsion polymerization of at least one ethylenically-unsaturated monomer is disclosed wherein a water-in-oil emulsion of said monomer is polymerized in the presence of a first, highly reactive polymerization initiator until a small amount of polymer is present sufficient to provide a shear-stable emulsion, followed by completing the polymerization in the presence of a second, less reactive polymerization initiator.
摘要:
A high molecular weight, water-soluble polymer, water-in-oil emulsions thereof and a flocculating process using same are disclosed. The polymer may be represented by the formula: ##STR1## wherein A represents a repeating unit derived from a hydrophobic vinyl monomer having a water-solubility of less than about 5 weight %; R.sub.1 and R.sub.3 are each hydrogen atom or a methyl group; R.sub.4 and R.sub.5 are each a hydrogen atom, a methyl group or an ethyl group; R.sub.2 represents a divalent hydrocarbon group having from 2 to 13 carbon atoms; X represents a monovalent cation; B represents a repeating unit derived from an ethylenically-unsaturated carboxylic acid or a salt thereof; m is about 0.1-10 mole %, n is about 1-40 mole %, p is about 20-98.9 mole %, and q is about 0-40 mole % with the proviso that m+n+p+q=100 mole % and r is a large positive integer.
摘要翻译:公开了一种高分子量的水溶性聚合物,其油包水乳液和使用其的絮凝方法。 聚合物可以由下式表示:其中A表示衍生自具有小于约5重量%的水溶性的疏水性乙烯基单体的重复单元; R1和R3各自为氢原子或甲基; R4和R5各自为氢原子,甲基或乙基; R2表示具有2至13个碳原子的二价烃基; X表示一价阳离子; B表示衍生自烯属不饱和羧酸或其盐的重复单元; m为约0.1-10摩尔%,n为约1-40摩尔%,p为约20-98.9摩尔%,q为约0-40摩尔%,条件是m + n + p + q = 100摩尔 %,r为大正整数。
摘要:
Improved contraceptive compositions are disclosed which comprise a spermicide or virucide, a polymeric delivery component and optionally a cosmetic ingredient. The improvement is directed to the use of certain hydrophobically modified polysaccharides as the polymeric delivery component. Quite advantageously, the hydrophobically modified polysaccharides of the present invention can alter sperm motility. Moreover, the hydrophobically modified polysaccharides can provide reduced irritation potential when used in combination with spermicides such as, for example, nonoxynol-9, which may reduce the potential for infection of sexually transmitted diseases such as HIV and herpes.