摘要:
There are disclosed and claimed novel polyamides showing transparency and other excellent properties, and the process for making them. The polyamides of the invention are prepared in the known manner and under common conditions by poly-condensing meta-xylylene diamine, which may optionally be partially substituted by para-xylylene diamine, at least one straight chain aliphatic diamine, at least one unsubstituted aromatic dicarboxylic acid and at least one aliphatic saturated dicarboxylic acid.
摘要:
There is disclosed a process for the preparation of novel transparent polyamides with improved properties. These polyamides are obtained by polycondensing 1,3-bis-(amino-methyl)-cyclohexane, which can be partly substituted by the 1,4-derivative, at least one aromatic dicarboxylic acid and at least one amino-carboxylic acid or the lactam thereof with at least one aliphatic straight chain or branched diamine or/and at least one aliphatic straight chain or branched dicarboxylic acid.
摘要:
A polyurethane corresponding to the formula: ##STR1## wherein Q is a divalent, mononuclear or dinuclear aromatic radial which is unsubstituted or is substituted by lower alkyl groups and which can contain, as a linking member, a lower alkylene group,X is one of the groups --O--Ph--Z--Ph--O-- and --OOC--(CH.sub.2).sub.y --COO--,Ph being an optionally substituted phenylene group,Z being an alkylene group having 1-4 carbon atoms and y being a number from 2 to 12,R is a hydrogen atom or a methyl group,Y is an alkylene radical having 2-6 carbon atoms,m is an integer from 4 to 50n is an integer from 1 to 6 ando is an integer from 4 to 20having the properties of thermoplasts and being hardenable to give elastic products. It is suitable for use as a hardenable constituent of photopolymerizable materials.
摘要:
The present invention relates to thermoplastic moulding compositions of (A) 99.5 to 80% by weight, of at least one amorphous linear polyamide and (B) 0.5 to 20% by weight of at least one segmented thermoplastic elastomeric copolyester. These novel moulding compositions combine good toughness and hardness with good elongation and stiffness properties as well as good flowing properties of the molten material.
摘要:
The specification discloses flame retarding plastic materials which contain, as the flame retarding agent, a phosphinic, diphosphinic or tri-phosphinic acid derived from 2-alkyl-2,5-dioxo-1,2-oxaphospholane and an organic monoamine or diamine or triamine, respectively.
摘要:
The present invention relates to a radiation-polymerizable mixture which includes a polymerizable compound, a polymeric binder which has units of methacrylic acid, a methacrylic acid ester and a styrene, the latter in a proportion of 40 to 65% by weight, a finely divided mineral pigment on a silicic acid or silicate basis, a photopolymerization initiator, a compound having at least two epoxy groups in its molecule and a thermal hardener for epoxy groups. The mixture is advantageous, in particular, for producing solder masks and can be cured after exposure to an image and development by heating to about 80.degree. to 150.degree. C. to form a stencil which is resistant under soldering conditions.
摘要:
A radiation-polymerizable mixture is described comprising (a) a compound which has at least two terminal ethylenically unsaturated groups and which can form a crosslinked polymer by means of free radical initiated chain addition polymerization, (b) a polymeric binder, (c) a radiation-activatable polymerization initiator which can be activated by radiation, and (d) a compound which is thermally crosslinkable with the polymeric binder (b), with the polymerization product of compound (a) and/or with itself and which, if its crosslinking groups are epoxy groups, has at least three epoxy groups. A photopolymerizable copying material is also disclosed having a flexible transparent temporary support and a transferable thermoplastic photopolymerizable layer comprising the foregoing radiation-polymerizable mixture. The photopolymerizable layer, after photocrosslinking, can be additionally cured by thermal crosslinking and is therefore suitable for the manufacture of solder resists and high performance printing plates.
摘要:
A polyurethane corresponding to the formula: ##STR1## wherein Q is a divalent, mononuclear or dinuclear aromatic radial which is unsubstituted or is substituted by lower alkyl groups and which can contain, as a linking member, a lower alkylene group,X is one of the groups --O--Ph--Z--Ph--O-- and --OOC--(CH.sub.2).sub.y --COO--,Ph being an optionally substituted phenylene group,Z being an alkylene group having 1--4 carbon atoms andy being a number from 2 to 12,R is a hydrogen atom or a methyl group,Y is an alkylene radical having 2-6 carbon atoms,m is an integer from 4 to 50n is an integer from 1 to 6 ando is an integer from 4 to 20having the properties of thermolasts and being hardenable to give elastic products. It is suitable for use as a hardenable constituent of photopolymerizable materials.
摘要:
The present invention relates to novel agents for the flame-proofing of polymers, especially transparent polyamides. These agents, phosphinylphosphinic acids, are used in quantities of 3 to 40 weight percent calculated on the weight of the polymer. These flame-proofing agents can easily be prepared and render the polymers flame-proof to a high degree without deteriorating the mechanical and physical properties.
摘要:
Permanently flame resistant filaments and fibers are produced from synthetic linear polyesters in which about 5 to 15 mol% of the acid component of the polyester consist of phosphinic acid structural units of the formula ##EQU1## in which R, R.sub.1 and R.sub.2 stand for organic radicals which may contain hetero atoms, preferably halogen, oxygen or sulfur. The filaments and fibers can be well dyed deep shades and are suitable in all fields of application where textiles which are hard to inflame are desired.