摘要:
The present invention is directed to a process for the production of optionally foamed polyurethanes which are combined or fabricated with another material, comprising reacting compounds with molecular weights from 400 to 10,000 containing at least 2 isocyanate reactive hydrogen atoms with polyisocyanates in the presence of catalysts containing tertiary amino groups and combining or fabricating the resulting polyurethane with another material, characterized in that the catalysts used are diffusion resistant aminoalkanols corresponding to the general formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 may be identical or different and represent hydrogen or a C.sub.1 -C.sub.6 alkyl group,R.sup.5, R.sup.6, R.sup.7 and R.sup.8 may be identical or different and represent a C.sub.1 -C.sub.6 alkyl group or together form a C.sub.2 -C.sub.6 alkylene group which may contain hetero atoms such as O or NR (R=C.sub.1 -C.sub.4 alkyl), and n and m may be identical or different and represent integers from 1 to 6.
摘要:
The invention relates to a process for the preparation of foamed or unfoamed polyurethanes by the reaction of compounds with molecular weights of 400 to 10,000 having at least two isocyanate-reactive hydrogen atoms with polyisocyanates in the presence of catalysts containing tertiary amino groups and optionally in the presence of chain-lengthening agents of molecular weight 32 to 400, foam stabilizers, water and/or organic blowing agents and optionally other auxiliary agents and additives, characterized in that the catalysts are morpholine derivatives of the general formula ##STR1## wherein X is an integer from 3 to 6 andR.sup.1 and R.sup.2 are identical or different and(a) represent a C.sub.1 -C.sub.6 -alkyl or C.sub.6 -C.sub.10 -cycloalkyl group or(b) form a heterocyclic ring containing 4-7 C-atoms, which heterocyclic ring may contain hetero groups in addition to the N-atom and wherein the additional hetero groups may be substituted by a C.sub.1 -C.sub.3 alkyl, or(c) together denote a group of the formula ##STR2## in which n and m are identical or different numbers from 2 to 4, preferably 2, or(d) represent ##STR3##
摘要:
Composite polyisocyanate addition products are formed from (1) the reaction product of a compound having at least two isocyanate-reactive hydrogen atoms and a molecular weight of from 400 to 10,000, a polyisocyanate and a catalyst which is a diffusion stable amino alkyl urea having tertiary amino groups and corresponds to the formula ##STR1## in which R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7 and n each represent specified groups or values and (2) another different material such as polyvinyl chloride, ABS, lacquers and textiles. Known additives such as blowing agents, chain extenders and foam stabilizers may optionally be used in the production of reaction product (1). The composite materials of the present invention which are particularly useful in the production of bedding and seating furniture, seats used in transport means, dashboard panels, arm-rests and for other similar applications are characterized by their lack of discoloration due to the diffusion of the catalyst employed in producing reaction product (1).
摘要:
An invisible infrared reflective computer vision tag includes an infrared reflective material with a printed or painted fiducial marker using an infrared opaque dye, toner, pigment or surface, covered by an infrared transparent dye toner, pigment or material.
摘要:
The invention relates to a process for the production of a foam composite element, comprising the steps of providing a facing, applying adhesion promoter, and applying a foam layer comprising polyurethane and/or polyisocyanurate to the adhesion promoter, characterized in that the adhesion promoter consists of at least one compound selected from the group consisting of polyether polyol (B.1), polymer polyol (B.2), polyurea dispersion (B.3), polyester polyol (B.4) and PIPA polyol (B.5). The invention relates further to the use of at least one compound selected from the group consisting of polyether polyol, polymer polyol and polyurea dispersion as adhesion promoter in the production of foam composite elements, as well as to foam composite elements produced by the process according to the invention.
摘要:
A belt buckle assembly, especially for a seat belt system in a motor vehicle, includes a belt buckle (10) and a plug-in tongue (12) lockable in the belt buckle (10) by means of a locking mechanism. A component of the locking mechanism of the belt buckle (10) interacting with the plug-in tongue (12) inside the belt buckle (10) and/or the plug-in tongue (12) has/have design features at a locking portion (16) interacting with the locking mechanism of the belt buckle (10) inside the belt buckle (10). The design features enable the plug-in tongue (12) to be locked in the belt buckle (10) only at one of at least two possible orientations of the plug-in tongue (12) in the belt buckle (10).
摘要:
A locking tongue has a base part, a webbing slot in the base part and a locking cam. The locking cam is movable between a rest position and a clamping position. A biasing means biases the locking cam towards the rest position. The locking cam can assume the rest position in which the belt webbing can pass freely through the webbing slot, a clamping position in which the locking cam presses the belt webbing against the clamping edge of the webbing slot, the biasing means being able to return the locking cam from the clamping position into the rest position, and a locking position in which the locking cam locks the belt webbing in the webbing slot, the biasing means not being able to return the locking cam from the locking position towards the rest position.
摘要:
The present invention provides a process for the production of polyurethane foams from A1 compounds which contain hydrogen atoms which are reactive towards isocyanates and have a molecular weight of 400-15,000, A2 optionally compounds which contain hydrogen atoms which are reactive towards isocyanates and have a molecular weight of 62-399, A3 water and/or physical blowing agents, A4 optionally auxiliary substances and additives, such as a) catalysts which differ from component A5, b) surface-active additives, c) pigments or flameproofing agents, A5 at least one tin(II) salt of carboxylic acids, the carboxylic acid having from 10 to 16 carbon atoms, and B di- or polyisocyanates, wherein the resulting polyurethane foams have low emission values and a good resistance to ageing.
摘要:
A system and method for incrementally maintaining column cardinality estimates in database management systems. In one embodiment, the system includes system catalog table containing a cardinality estimate for a column that is extended to include an appropriate data structure. A modified linear counting technique is used in a first embodiment of a method for column cardinality estimation. The cardinality estimate is produced by an initial scan of the data but is then further maintained without requiring a full scan of the data. Data changes are reflected incrementally in modifications to the initial cardinality estimate, keeping the cardinality statistics more current with respect to the database condition. The technique of the invention typically provides a capability for a database management system to produce more efficient search plans providing more effective responses to user queries through the use of improved cardinality statistics.
摘要:
Reinforced polyurethane/urea elastomers with a specified proportion of urea groups and a specified proportion of urethane groups are produced from an isocyanate-reactive component satisfying specified compositional requirements and an isocyanate-terminated prepolymer produced from specified materials. Two-dimensional polyurethane molded articles produced from these reinforced elastomers are characterized by improved toughness and improved shrinkage characteristics. Such molded articles are particularly useful for making automobile components.