Abstract: A thermosetting oligomer or thermosetting polymer is provided. The thermosetting oligomer or thermosetting polymer contains repeating units, each of which has at least one thermosetting functional group in the side chain and is represented by Formula 1: where repeating units include X1, A1, and Y1 subunits, sidechain units include linking unit L and thermosetting functional group Z, and n is an integer from 1 to 4. The thermosetting oligomer or thermosetting polymer has a low coefficient of thermal expansion and high or no glass transition temperature, stiffness, processability, heat resistance and mechanical properties. The thermosetting oligomer or thermosetting polymer is highly soluble, wettable and dimensionally stable and is suitable for use in films, prepregs and printed circuit boards. Further provided are a thermosetting resin composition including the thermosetting oligomer or thermosetting polymer and a printed circuit board using the composition.

Abstract: To provide a polymer material having properties that allow the polymer material to replace a polyimide and a polyamide synthesized from a petroleum raw material, said polymer material being synthesized from a raw material derived from natural molecules. [Solution] This polymer material is obtained by polymerizing a polymer raw material comprising a dimer of 4-amino cinnamic acid or a dimer of a 4-amino cinnamic acid derivative, which are natural molecules, wherein the carboxyl group is protected by an alkyl chain. The TGA curve of a polyamide acid (PAA-1) and a polyimide (PI-1) according to the present invention is shown in FIG. 5.

Abstract: The present invention relates to polymer, homo- or copolymer or oligomer for the photoalignment of liquid crystals, especially for the planar orientation of liquid crystals, comprising a main chain and a side chain, wherein the side chain and/or main chain comprises a polar group, compositions thereof, and its use for optical and electro optical devices, especially liquid crystal devices (LCDs).

Abstract: The present invention relates to a method of prepairing a heat-resistant polyamide by carrying out condensation polymerization with a monomer mixture including a diester compound and a diamine compound. The present invention provides an economical method of prepairing a heat-resistant polyamide in that a monomer, a raw material, is simply and chiefly prepared, and the polymerizing reaction time is short because it does not need solvent separately.

Abstract: This invention comprises a semiconducting polymer having a permittivity greater than 3.4 at 1000 Hz and a charge mobility in the pure state greater than 10?7 cm2V?1s?1 and more preferably greater than 10?6 cm2V?1s?1. Preferred polymers include repeating units of triarylamines which have specific cyano and/or alkoxy substitution. They are suitable for use in electronic components such as organic thin film transistors.

Abstract: A polyamide compound containing from 25 to 50 mol % of a diamine unit that contains at least 50 mol % of an alicyclic diamine unit represented by the following general formula (I); from 25 to 50 mol % of a dicarboxylic acid unit that contains a linear aliphatic dicarboxylic acid unit represented by the following general formula (II-1) and/or an aromatic dicarboxylic acid unit represented by the following general formula (II-2) in an amount of at least 50 mol % in total; and from 0.1 to 50 mol % of a constituent unit represented by the following general formula (III): wherein, in the formulae, n indicates an integer of from 2 to 18; Ar represents an arylene group; and R represents a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group.

Abstract: This invention relates to poly(ester amide)s (PEAs) comprising inactivated terminal amino and carboxyl groups, methods of synthesizing the inactivated PEAs and uses for them in the treatment of vascular diseases.

Abstract: A benzo-fused-heterocyclic elongated dye having a superior molecular hyperpolarizability and yet having an acceptably-low optical absorbance of light near 1550 nm in wavelength, which is an important optical communication band for telecommunication applications.

Abstract: A benzo-fused-heterocyclic elongated dye having a superior molecular hyperpolarizability and yet having an acceptably-low optical absorbance of light near 1550 nm in wavelength, which is an important optical communication band for telecommunication applications.

Abstract: The present invention relates to the use of a system composed of a base and of a sulphonamide, as a catalyst for the ring-opening (co)polymerization of lactones. The present invention also relates to novel sulphonamides and to a process for the ring-opening (co)polymerization of lactones comprising the use of sulphonamides in combination with a base as a catalytic system.

Abstract: The present invention relates to a fluorine-containing polymerizable monomer represented by the formula [1], [Chem. 31] wherein “a” represents an integer of 1-4. This monomer has a plurality of polymerizable amines in the molecule and at the same time a hexafluoroisopropyl group(s). With this, it can be used as an effective polymerizable monomer, which can exhibit water repellency, oil repellency, low water absorptive property, heat resistance, weather resistance, corrosion resistance, transparency, photosensitivity, low refractive index property, low dielectric property, etc., and can be used for advanced polymer material fields.

Abstract: A continuous process for producing polyamides, their oligomers or mixtures thereof, if appropriate with further reaction products, comprises reaction of aminonitriles or dinitriles and diamines or mixtures thereof, if appropriate together with further polyamide-forming monomers and/or oligomers, with an aqueous medium composed of aqueous monomer and oligomer extracts obtained from polyamide production by extraction of the polymer with water in a reactor which has a vertical longitudinal axis and through which there is a flow substantially in the longitudinal direction wherein water and/or the aqueous medium are introduced into the reactor at two or more different locations along the vertical longitudinal axis, wherein the aqueous medium is introduced at one or more locations.

Abstract: A description is given, together with preferred applications, of a transparent polyamide elastomer of the general structure (I), where R1 is a polyamide segment formed from (a) 10-100 mol % of alkyl-substituted bis(aminocyclohexyl)methane and/or bis(aminocyclohexyl)propane and 0-90 mol % of other cycloaliphatic C6-C36 diamines and/or aliphatic C2-C36 diamines and/or aromatic C6-C36 diamines, the concentration figures being based on the total amount of diamine in the polyamide segment, and (b) aliphatic C4-C36 dicarboxylic acids and/or cycloaliphatic C8-C36 dicarboxylic acids and/or aromatic C8-C36 dicarboxylic acids, and (c) optionally lactams and/or aminocarboxylic acids C6-C12, R2 being selected from the group of the divalent radicals: linear or branched C2-C5 polyoxyalkylene, polyolefin, polysiloxane with a number-average molar mass in the range of 200-3000 g/mol, linear or branched, substituted or unsubstituted C2-C36 alkylene, C6-C36 cycloalkylene, C6-C20 aryl, polycaprolactone, polyesters based on aliph

Abstract: The present invention provides photo-reactive compound. The photo-reactive compound, in which chains are combined to a polymer backbone that is used for a photo-alignment layer compound, is represented by the following Formula 1 or Formula 2. L denotes a substituted or unsubstituted alkyl group having at least 1 but no more than 18 carbons, V denotes a substituted or unsubstituted alkyl group having at least 1 but no more than 18 carbons, R1, R2, and R3 each denote H or a substituted or unsubstituted alkyl group having at least 1 but no more than 18 carbons, X+Y=1, 0<X, and Y<1.

Abstract: Polyamide, whose main chain contains a chemically bound amine selected from the group consisting of 2-methyl-1,5-diaminopentane and 1-amino-2-R-cyclopent-1-ene, where R is a functional group capable of combining with an amino group to form an amide group, and processes for preparing such a polyamide and fibers, films and moldings comprising such a polyamide.

Abstract: The present invention provides a conjugated polymer with provided thereon at least one molecular imprinted polymer (MIP) and a method for preparing such a polymer. The conjugate polymer provided with at least one MIP according to the invention combines both transducer properties and selectivity properties in one single material. Therefore, it is particularly suitable for use in chemo- or bio-sensors. Furthermore, the conjugate polymer provided with at least one MIP may be used in electronic devices and in chromatography, molecular recognition, selective sample enrichment or in catalysis.

Abstract: It is an object of the present invention to provide the method for determining cholesterol in lipoprotein and reagent for determining cholesterol comprising the polymer, and the present invention relates to the reagent for determining cholesterol in lipoproteins such as high-density lipoprotein (HDL), low-density lipoprotein (LDL) and very low-density lipoprotein (VLDL) and the determination method using the polymer comprising the following units as constituents: (iv) a polyethylene glycol segment represented by the general formula [1]: —(CH2CH2O)k—??[1] (wherein, k represents an integer of 10 to 250); (v) a monomer unit represented by the general formula [2]: (wherein R1 represents a hydrogen atom or C1-C3 alkyl group); and (vi) a monomer unit represented by the general formula [3]: [wherein, R2 represents a hydrogen atom or C1-C3 alkyl group, and R3 represents a group represented by the general formula [4]: —COOR4??[4] (wherein, R4 represents an alkyl group, a haloalkyl group or a bornyl g

Abstract: A positive photosensitive resin composition containing 100 parts by weight of a polyimide precursor (A) having a constituent unit represented by the formula (1), 15 to 25 parts by weight of a crosslinking agent (B) represented by the formula (2), and 2 to 5 parts by weight of a photosensitizer (C) generating acid upon irradiation of an actinic ray: wherein m is an integer of 1 or greater, and R is an aromatic group or an aliphatic group having a valency of 1 or higher. The positive photosensitive resin composition can be developed by using an aqueous solution of alkali metal carbonate, is capable of forming micropatterns, and has excellent thermal resistance and the like. A method for forming a positive pattern, and uses thereof are also provided.

Abstract: The present invention relates to crosslinked polymeric nanospheres having a star-shaped structure of the core-branch type, in which the branches are of a hydrophilic nature and the core is of a polymeric, crosslinked, hydrophobic nature and forms the imprint of all or at least part of a target molecule and to a process for preparing them.

Abstract: Disclosed is a fluorine-containing polymerizable monomer represented by the formula [1] below. (In the formula [1], a represents an integer of 1-4.) By having a plurality of polymerizable amines in a molecule while containing a hexafluoroisopropyl group, this fluorine-containing polymerizable monomer exhibiting water repellancy, oil repellency, low water absorbency, heat resistance, weather resistance, corrosion resistance, transparency, photosensitivity, low refractive index, low dielectric properties, and the like, and thus can be applied to the field of advanced polymer materials.

Abstract: A polyamide that includes the reaction product of dimer acid (e.g. a dimer acid including at least 98% by weight dimer), caprolactam, hexamethylene diamine, sebacic acid, and optionally, chain terminating agent.

Abstract: Copolymers having linked internal polyether blocks and internal polyamide blocks have advantageous physical properties and solvent-gelling abilities. The copolymer may be prepared from a reaction mixture that contains 1,4-cyclohexane dicarboxylic acid (CHDA) and poly(alkyleneoxy) diamine (PAODA). Optionally, the reaction mixture contains no monofunctional compound reactive with either amine or carboxylic acid groups, however some of this monofunctional compound may be present. Dimer diamine and/or dimer acid may be present in the reaction mixture. A copolymer may also be prepared from a reaction mixture containing dimer acid and at least two diamine compound(s) including PAODA and short-chain aliphatic diamine having 2-6 carbons (SDA), wherein: a) the reaction mixture comprises x grams of PAODA and y grams of SDA, and x/(x+y) is 0.8-0.98; b) the reaction mixture weighs z grams, and x/z is at least 0.

Abstract: A coating powder comprising a macrocyclic oligomer and a ring-opening polymerization agent is applied to an article, fused, and converted to a linear polymer at a temperature of from about 160 to about 400° C. The powder has the low melt viscosity and friability of a thermoset powder but is converted at high fusing temperatures to a tough coating having the good impact resistance and good elongation of a thermoplastic powder. The oligomer is a polyester, polycarbonate, polyamide, polyimide, polyamideimide. The article may be coated electrostatically or in a fluidized bed.

Abstract: A process for making partially aromatic polyamides is provided in which an aromatic dicarboxylic acid component, at least 20-100% by weight of the dicarboxylic acid in the acid component is in the form of an alkylated ester, and a diamine component, comprising a diamine having from 6-12 carbon atoms, are admixed in the presence of water and with heating to form polyamide having from 1-100% on a molar basis of N-alkylated amide and amine groups. The polyamides are particularly useful in the manufacture of products intended for use at elevated temperatures or products in which retention of properties at elevated temperatures is required, including articles using injection molding technology, parts for automotive end-uses and electronics. The polyamides can also be formed into films and fibers for use in associated products.

Abstract: The synthesis of dimethyl-1,5-naphthalenedicarboxylate and polymers and articles formed therefrom is disclosed, as well as applications for dimethyl-1,5-naphthalenedicarboxylate, its corresponding acid 1,5-NDA, and various synthesis intermediates.

Abstract: Car part made from a polyamide composition wherein the polyamide substantially consists of 60-99 wt. % units derived from aliphatic dicarboxylic acids and diamines and the remaining chain units are derived from cycloaliphatic dicarboxylic acid(s) and an aliphatic diamine or cycloaliphatic diamine(s) and an aliphatic dicarboxylic acid.

Abstract: Preparation of thermally and/or photochemically crosslinkable oligomeric precursors and the use of those oligomeric precursors in preparing crosslinked electroactive polymers are described. The oligomers, polymers, and synthetic methods find utility in the manufacture of opto-electronic devices such as light emitting diodes, photoconductors, photovoltaic cells, and the like, wherein synthesis of electroactive films and polymeric multilayers is required.

Abstract: An ink-jet printing dye-fixing agent is provided which comprises a quaternary cationic polymer having the main chain represented by general formula (1): ##STR1## where R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are independently an aliphatic alkyl group of 1 or 2 carbons; R is an aliphatic alkene group of 1-6 carbons or a phenylene group; and n is an integer of from 3 to 300. A recording paper sheet employing the fixing agent is also provided. This fixing agent has excellent ink dye fixability, and makes ink coloring excellent and improves water resistance of the printed matter.

Abstract: This invention is an improvement in standard polymerizations procedures, i.e., addition-type and step-growth type polymerizations, wherein momomers are reacted to form a growing polymer chain. The improvement includes employing an effective amount of a trifunctional monomer (such as a trifunctional amine, anhydride, or phenol) in the polymerization procedure to form a mixture of polymeric materials consisting of branced polymers, star-shaped polymers, and linear polymers. This mixture of polymeric materials has a lower melt temperature and a lower melt viscosity than corresponding linear polymeric materials of equivalent molecular weight.

Abstract: A process for producing polymers of .alpha., .omega.-unsaturated conjugated compounds, which includes reacting a compound of the formula (I),B--A--C (I)whereinB denotes a sp.sup.3 -hybridized carbon atom carrying at least one hydrogen atom,A denotes a conjugated-.pi.-system or a --CH.dbd.CH--group, andC denotes a carbon atom carrying at least one leaving group,with a base in a solvent. On reaction of the base with the compound of the formula (I) a polymer is formed as a by-product essentially soluble in the solvent and a solid is formed as a by-product which is essentially insoluble in the solvent. According to the process, chemically and thermally stable, high molecular weight polymers of high purity and high regularity are obtained in good yield. If the products of the process carry groups that undergo elimination, forming double bonds, high quality electroluminescent materials can be prepared.

Abstract: An uncoated lens, especially for use as the lens of a fog light or a headlight for an automobile, and having particularly good resistance against the environmental effects which are inherent in this environment, is formed of a colorless, transparent copolyamide having a glass transition temperature of at least a 170.degree. C., blended with a homopolyamide, and wherein the copolyamide is formed from at least one cycloaliphatic diamine with two cyclohexane rings, and at least one aromatic dicarboxylic acid which is predominantly isophthalic acid. The copolyamide may optionally contain up to 20 mol % of a further polyamide forming monomer of at least one lactam or an omega-aminocarboxylic acid. The homopolyamide is preferably one of PA6, PA11, PA12, PA66, PA69, PA610 or PA612. The cycloaliphatic diamine of the copolyamide is preferably bis(3-methyl-4-aminocyclohexyl)-methane.

Abstract: Polymer-based polyvalent malonic acid derivatives having anti-adhesive properties are described. The compounds comprise a polyamino acid linked to a group of formula (I). In formula (I), R.sup.1 and R.sup.2 together form a six-membered carbocylic or heterocyclic ring, containing at least one substituent selected from R.sup.4, R.sup.5, and R.sup.6. R.sup.3 is H, (CH.sub.2) .sub.m X or CH.sub.2 O(CH.sub.2).sup.m X.sup.1. The polyamino acid and the group of formula II are linked via R.sup.4, R.sup.5, or R.sup.6, or optionally via a spacer of formula --?Q.sup.1 --(CH.sub.2).sub.p --Q.sup.2 --!.sub.r. A and B independently are O, S, NH, HN--CO, OC--NH, O--CO, OC--O, NH--CO--O, --O--CO--NH, S--CO, SC--O, O--CS--S, S--CS--OS, NH--CS--S, S--CS--NH, or CH.sub.2. Z is a pyranose, furanose, open-chain polyalcohol or Y--X.sup.6. Y is --O--(CX.sup.2,X.sup.3).sub.n, -(CX.sup.2,X.sup.3).sub.n, --CH.sub.2 --(CX.sup.2,X.sup.3).sub.

Abstract: The present invention relates to a fluorene-based alternating copolymer to be used as light emitting materials of electroluminescent elements having the following formula (I), and further relates to electroluminescent elements having an anode/luminescent layer/cathode structure, in which the fluorene-based alternating copolymer used as light emitting materials of the luminescent layer, or having a transporting and/or reflection layer added thereto, if necessary, is ##STR1## where R, R', X, Ar and n are defined in the text.

Abstract: A process for producing polymers of .alpha.,.omega.-unsaturated conjugated compounds, comprising reacting a precursor monomer of the formula I, ##STR1## wherein P denotes --SR.sup.3, --SO--R.sup.3, --SO.sub.2 --R.sup.3, --COOR.sup.3, --NO.sub.2, --CN, --CF.sub.3 or R.sup.3 ; L denotes --Cl, --Br, --I, --O-tosylate, --O-mesylate, --O-triflate, --(NR.sup.3.sub.3).sym. or --(SR.sup.3 R.sup.4).sym.; R.sup.1,R.sup.2 are the same or different and denote H, R.sup.3 or P; R.sup.3, R.sup.4 and A are as defined in the application. This reaction is characterized in that, on reaction of the base with the compound of the formula (I), a polymer is formed which is essentially soluble in said solvent, and a salt is formed as a by-product, which is essentially soluble in the solvent. That solvent comprises a compound selected from the group consisting of a) amides of the general formula (II) R.sup.5 --CO--NR.sup.6 H; b) amines of the general formula (III) R.sup.7.sub.2 --N--R.sup.8 ; c) sulfones of the general formula (IV) R.

Abstract: Monoallyloxyimides, diallyloxyimides and polyallyloxyimides of general Formula I. ##STR1## wherein: X is an integer from 1 to 4 inclusive;R.sup.1, R.sup.2, and R.sup.3 are independently selected from the group comprising hydrogen, alkyl, arylalkyl or halogen; andA is all or part of an aromatic, alicyclic or mixed aromatic/alicyclic ring system optionally substituted with one or more alkyl, alkoxy, alkylthio, aryl, heteroaryl, aryloxy, carboxy, alkylamino, dialkylamino, amino, nitro, cyano, halo or haloalkyl groups.This new class of reactive monomer can be used as co-reactants in themosetting matrix resins. The reactive monomers, either alone or with other comonomers, can give rise to cured resin matrix materials with high thermal stability. Mixed with suitable bismaleimide monomers, they can be cured into useful composites having substantially improved thermal stabilities.

Abstract: Disclosed are cosmetic melanins of different colors produced by procedures involving oxidative polymerization of monomeric precursors of melanin and/or co-monomers that enhance substantivity or adherence of the melanins to the skin and hair. Also disclosed are methods for preparing cosmetic melanins and methods for using these compositions topically to produce a natural-appearing tan and to prevent damage to skin caused by UV exposure.

Abstract: To prepare nitrogen-containing aromatic polymers, for example polyamides, polyimides and polybenzimidazoles, polyvalent aromatic carboxylic acids and aromatic diamines and/or aminocarboxylic acids or reactive derivatives thereof are reacted in a high-boiling inert solvent with the addition of a heat-stable dispersing auxiliary, and volatile by-products formed in this reaction are distilled off. When the reaction has ended, the batch is cooled and the polymer formed is filtered off.

Abstract: A re-moldable cross-linked resin comprising polymer chains which are connected to one another via Diels-Alder adducts obtainable from a dienophile and a diene, the latter being a 2,5-dialkyl substituted furan.

Abstract: A nonlinear optical material composed of a polyimide obtained from a diamine and/or a diacid anhydride or dithioacid anhydride substituted by a portion having a nonlinear optical effect or of molecules having a benzocyclobutene structure substituted at the portions having an nonlinear linear optical effect.

Abstract: The present invention is directed to an exciplex formed from a .pi.-conjugated polymer and an electron donor or acceptor component. The present invention also relates to assemblies comprising said exciplex, their use in optoelectrical devices and method of enhancing optoelectrical properties of .pi.-conjugated polymers by forming said exciplex.

Abstract: Aramid polymers with small amounts of alkyl- and/or alkoxy-substitution on their aromatic diamine and/or aromatic diacid monomeric units are disclosed. Such aramid polymers show improved properties compared to similar aramids without the substitution. The aramids described herein are useful for films or fibers, for example, as employed in the manufacture of packaging, ropes, filter bags, or composites. The invention also includes a process for making such polymers, involving subjecting fibers or films made from such aramid polymers to heat treatment under tension.

Abstract: The invention provides a bioelastomer comprising tetrapeptide and/or pentapeptide monomeric units of the formula:R.sub.1 PGR.sub.2 G.sub.nwherein R.sub.1 is a peptide-producing residue of alanine or glycine; P is a peptide-producing residue of proline; G is a peptide-producing residue of glycine; R.sub.2 is a peptide-producing residue of glycine or alanine; and n is 0 or 1. In a further aspect of the invention, a method is provided for preventing adhesion of biological materials, such as protein, cells, and tissues, by forming a protective layer between a first surface and a second surface using the bioelastomer.

Abstract: A process for producing a modified polyaminoamide with markedly increased reactivity as an epoxy resin curing agent is disclosed. The process comprises introducing amino groups and mercapto groups into a polyaminoamide by using an aziridine compound and a thiirane compound. The modified polyaminoamide is capable of curing an epoxy resin at a low temperature and at a high rate to provide a cured epoxy resin excellent in anticorrosion and chemical resistance.

Abstract: Sheath-core polyamide filaments are disclosed which are resistant to staining by coffee and acid dyes common in food and beverages. The sheath component is comprised of a partially aromatic or high carbon polyamide. The core component may be nylon 66, nylon 6 or copolymers thereof. Textile articles made from these sheath-core filaments are also disclosed.

Abstract: A structural panel for a vehicle or building contains a substrate and a layer of flame resistant polybenzazole polymer. If the substrate is heat resistant, the panel can serve as a fire barrier. If the substrate is not heat resistant, the polybenzazole layer can still serve to delay ignition and contain any volatile gases and molten polymer that forms when the panel is subjected to heat.

Abstract: A method is disclosed for significantly diminishing the rate of degradation of naturally-produced .gamma.-PGA in a .gamma.-PGA-producing cell culture. Also, a method is disclosed for significantly decreasing the water solubility coefficient of naturally-produced .gamma.-PGA by forming derivatives of .gamma.-PGA. In addition, a polymer solution is disclosed which includes a polysaccharide component and a .gamma.-PGA component.

Abstract: Novel cyclic imino ether compositions containing one or more mesogenic moieties, when polymerized, result in products having improved properties.

Abstract: A process for the manufacture of polyamides consisting essentially of the stages of:(i) reacting 10 to 90% by weight of the aliphatic and/or cycloaliphatic and/or aromatic-aliphatic diamines (c) with a lactam and/or corresponding amino acid (a) or the substantially stoichiometric combination of one or more aliphatic diamine(s) and of one or more dicarboxylic aliphatic acid(s) and with the aromatic diacid (b); and(ii) reacting the remainder of the aliphatic and/or cycloaliphatic and/or aromatic-aliphatic diamine (c) with the oligomer produced in stage (i) in one or more substages.

Abstract: Azole rings, such as oxazole and thiazole rings, can activate an aromatic ring bonded to a leaving group such as a halogen atom so that the aromatic ring will undergo aromatic nucleophilic substitution. The reaction is useful for making ethers, thioethers and amines containing azole rings. In particular, monomers having azole rings, activated aromatic rings with leaving groups and nucleophilic moieties can react under conditions of aromatic nucleophilic displacement to form non-rigid rod PBZ polymers. The non-rigid rod PBZ polymers can be used to form molecular composites with rigid rod PBZ polymers which molecular composites are not substantially phase separated.

Abstract: Block copolyetheramides, well adopted for conversion into a wide variety of useful thermoplastic elastomer shaped articles, have the formula: ##STR1## in which D is the residue of a diacid oligamide having an Mn ranging from 300 to 3,000 and/or the residue of the diacid chain limiter, PE is the residue of a polyetherdiol having an Mn ranging from 200 to 5,000,.times.is a straight or branched chain (cyclo)aliphatic or aromatic hydrocarbon having from 4 to 20 carbon atoms, n is a number ranging from 1 to 4, and m is an average number ranging from 2 to 50; these are prepared by polycondensing a multiblock polymer having the formula: ##STR2## with a diamine H.sub.2 N--X--NH.sub.2.