摘要:
A Dyligomer is disclosed. The Dyligomer has the structure 1 where B is a chemical moiety formed by reactions involving the NCO groups of a diisocyanate the formulas OCNnullBnullNCO and the active hydrogens of OH groups of compounds having the formulas AnullOH and DnullOH, and A and D are chemical moieties formed by the reactions which formed B, and wherein A and D include, in their structures, at least two active hydrogens which are parts of OH groups and at least one ethylenic double bond. Also disclosed are polymerizable compositions comprising Dyligomers and their use to produce structural panels that are admirably suited for use as floors in refrigerated trucks and trailers, and in roofs, sidewalls and load bearing walls for homes and commercial buildings. Blocks which can be used to produce buildings are also disclosed, as is the use of Dyligomers to produce the blocks, and the use of the blocks to produce building structures.
摘要:
The flameproofed, rigid, isocyanate-based foams, in particular rigid polyurethane and polyisocyanurate foams, are produced by reactinga) organic and/or modified organic polyisocyanates withb) at least one relatively high-molecular-weight compound containing at least two reactive hydrogen atoms, and, if desired,c) low-molecular-weight chain extenders and/or crosslinking agents, in the presence ofd) blowing agents,e) catalysts,f) flameproofing agents, and, if desired,g) further auxiliaries and/or additives,wherein the flameproofing agent is a combination of at least one liquid flameproofing agent which is reactive toward isocyanates and at least one solid flameproofing agent.
摘要:
Polyoxyalkylene polyether polyols suitable for preparation of flexible polyurethane foams are prepared by oxyalkylating an aqueous solution of one or more polyhydric, hydroxyl-functional solid initiators under conditions where both water as well as initiator are oxyalkylated. The polyols have calculated functionalities of between about 2.2 and 4.0 and hydroxyl numbers in the range of 10 to 180. The polyols may be used to prepare soft, high resiliency polyurethane flexible foams at low isocyanate indexes.
摘要:
Rigid polyurethane foam and laminate articles comprising a facing material and the said polyurethane foam are prepared by contacting under reaction conditions a urethane-modified polyisocyanate with a polyahl in the presence of a blowing agent comprising water. The urethane-modified polyisocyanate has an isocyanate content of from about 10 to about 29 weight percent and is obtained by reacting a polymethylene polyphenylisocyanate with a polyether polyol having a molecular weight of at least 2000 and an oxyethylene content of at least 35 weight percent. Use of this polyisocyanate provides for enhanced adhesion of the resulting foam, especialIy when it is an all-water blown foam, to facing materials such as metal.
摘要:
A low water contact lens material having high O.sub.2 permeability, a lower water content and reduced polymer matrix size provides adequate O.sub.2 to the cornea, but does not wick water away from the eye nor allow protein or other tear components to penetrate and deposit in the lens. Such a lens is made by polymerizing and crosslinking a prepolymer which contains a cyclic polyol with polyalkylether segments containing curable segments. The cyclic polyols consist of alkoxylated glucose or sucrose which are then reacted with an isocyanate to produce an ultraviolet curable prepolymer. The prepolymer is then placed in a mold and polymerized by exposure to ultraviolet light. The free hydroxyl groups of the material react with a highly hydrophilic reagent to form covalent bonds thus making the surface of the material more wettable.
摘要:
A castable thermosetting polyurethane polymer, having improved heat-stability characteristics, comprising (A) a polymeric methylene diisocyanate, (B) a propyleneoxide-extended polyol which is preferably a sugar-based polyol, (C) a polyether diol or triol, and (D) dipropylene glycol or diethylene glycol, in amounts respectively between about 35-45 parts by weight, 35-45 parts by weight, and 12-20 parts by weight, per 100 parts by weight of total diol and triol (resin) components, providing an NCO/OH ratio between about 1:1 and about 1.2:1, an effective polyurethane-catalyzing amount of (E) a urethane catalyst, and optionally comprising an effective amount of a drying agent, is disclosed. The cast polyurethane polymer of the invention withstands temperatures of 450.degree. F. (232.degree. C.) for 20 minutes without visual polymer degradation, whereas most other castable polyurethane systems degrade between 350.degree. F. and 375.degree. F., as a result of which heat-stability the polymer of the present invention is especially suitable for post finishing which involves the employment of higher temperatures, such as painting with thermosetting coatings, powder coating, and anodizing.
摘要:
The present invention relates to a process for the preparation of polyurethane rigid foams having a low thermal conductivity, comprising reacting:a) organic and/or modified organic polyisocyanates with,b) at least one higher molecular weight compound having at least two reactive hydrogen atoms, and optionallyc) lower molecular weight chain extending agents and/or crosslinking agents in the presence of,d) cyclopentane (d1) or mixtures (d2) comprising, d2i) cyclopentane, and/or cyclohexane, d2ii) at least one compound homogeneously miscible with cyclopentane and/or cyclohexane, said compound preferably has a boiling point below 35.degree. C. and is selected from the group consisting of alkanes, cycloalkanes having a maximum of 4 carbon atoms, dialkylethers, cycloalkylene ethers and fluoroalkanes, optionally combined with water as said blowing agent (d),e) catalysts, and optionallyf) auxiliaries and/or additives.Polyurethane rigid foams are used in the low temperature appliance industry and as insulating materials in heating and composite elements.
摘要:
Polyisocyanate crosslinked cyclodextrin resins prepared within a certain mole ratio of polyisocyanate to cyclodextrin are soluble in solvents such as pyridine and dimethylformamide but highly insoluble in water. Such resins have excellent adhesive properties toward virtually all solid surfaces which consequently can be readily coated with a thin film having a multiplicity of cyclodextrin moieties available at the surface for separation and/or purification. Such coated substrates can be prepared in a variety of sizes, shapes, and cyclodextrin loading quite conveniently and relatively inexpensive.
摘要:
This invention relates to polyether polyols having an average hydroxyl value in the range of 100 to 250 mgKOH/g, which are alkoxylated derivatives of a polyhydric alcohol being a mixture of compounds according to formula (I) or/and (II) ##STR1## wherein R.sup.1 is H, CH.sub.3 or OCH.sub.3,R.sup.2 is H, CH.sub.2 OH or CH.sub.2 C(CH.sub.2 OH).sub.3, andR.sup.3 and R.sup.4 areH, CH.sub.2 OH or CH.sub.2 OCH.sub.3.