A temperature-responsive material having a structure represented by formula (I):

##STR00001## is provided, where in formula (I), X has a structure represented by formula (i) or formula (ii):

##STR00002## x and y are in a molar ratio of 9:1 to 1:3, n is an integer of 7 to 120, and m is an integer of 10 to 1,000.

Polymers and methods of making the same are described whereby the polymers generically include one or more units each of which necessarily has a 1,2,4-substituted cyclohexane group or a 1,1,2,4-substituted cyclohexane group. According to specific disclosures herein, polymers and methods of making the same are described whereby the polymers have one or more S1 units represented by the formula:

##STR00001##

wherein n is an integer equal to or higher than 1, m is 0 or 1, A is H or CH.sub.3, and wherein each of X and Y is a specifically defined group.

A liquid crystalline polyester liquid composition containing a liquid crystalline polyester (A) that is soluble in an aprotic solvent, a liquid crystalline polyester (B) that is insoluble in an aprotic solvent, and an aprotic solvent (S), wherein the liquid crystalline polyester (A) and the liquid crystalline polyester (B) are liquid crystalline polyesters that have a structural unit derived from a hydroxycarboxylic acid as a mesogenic group.

Polymers and methods of making the same are described whereby the polymers generically include one or more units each of which necessarily has a 1,2,4-substituted cyclohexane group or a 1,1,2,4-substituted cyclohexane group. According to specific disclosures herein, polymers and methods of making the same are described whereby the polymers have one or more S1 units represented by the formula: ##STR00001##
wherein n is an integer equal to or higher than 1, m is 0 or 1, A is H or CH.sub.3, and wherein each of X and Y is a specifically defined group.

Provided is a compound which may be obtained by esterification condensation of components as described herein. The compound may be used as a collector for ore enrichment (flotation), as a corrosion inhibitor, as a viscosity enhancer, emulsifier or stabilizer that is useful for the oil and gas industry, as a clay modifier, as an adhesion promoter, as an antiagglomerant additive, as an additive in haircare products, as a fabric softener, as an antistatic agent in polymers, as a bitumen emulsion additive, as a detergency cationic agent, as a fertilizer additive, as an antiagglomerant for hydrates, as a lubrication or adhesion-promoting additive, for example.

A method for preparing tyrosine derived polyarylates includes combining a desaminotyrosyl-tyrosine ethyl ester, a desaminotyrosyl-tyrosine benzylester, succinic acid and a catalyst in a flask to produce a first mixture. Methylene chloride is added to the first mixture to produce a first suspension. Diisopropylcarbodiimide (DIPC) is added to the first mixture to produce a first solution. The first solution is added to a non-solvent to produce a precipitate. The precipitate is dissolved in methylene chloride to form a polymer solution. The polymer solution is blended with a slurry to produce polymer shreds. The polymer shreds are blended with a second slurry to produce a tyrosine derived polyarylate.

Method for obtaining biodegradable polymers that has a stage of esterification and/or transesterification and amidation reaction, a stage of prepolycondensation, a stage of polycondensation, a stage of extraction and a stage of drying, eliminating the use of chain extenders. The polymer can achieve all the range of viscosities desired and with an improved colour compared to the polymer from other methods, where chain extenders are used, provide a more efficient process, that is environmentally cleaner and safer for the operatives.

A method for preparing tyrosine derived polyarylates includes combining a desaminotyrosyl-tyrosine ethyl ester, a desaminotyrosyl-tyrosine benzylester, succinic acid and a catalyst in a flask to produce a first mixture. Methylene chloride is added to the first mixture to produce a first suspension. Diisopropylcarbodiimide (DIPC) is added to the first mixture to produce a first solution. The first solution is added to a non-solvent to produce a precipitate. The precipitate is dissolved in methylene chloride to form a polymer solution. The polymer solution is blended with a slurry to produce polymer shreds. The polymer shreds are blended with a second slurry to produce a tyrosine derived polyarylate.

The present invention relates to a special process for preparing polyesterols having terminal hydroxyl groups and containing imide groups, to the polyesters per se, and to their use for the preparation of polyurethanes.

There is provided a polymer comprising: (i) a repeat unit derived from a compound of formula (I) (Formula (I)) wherein, R.sup.1 and R.sup.2 are each independently selected from OH, OR, SH, SR, NH.sub.2, NHR and NR.sub.2; R is C.sub.1-20 hydrocarbyl; each n is independently 0 or an integer between 1 and 6; each m is independently 0 or an integer between 1 and 4, and preferably at least one m is 1; and q is an integer between 1 and 8; and; (ii) a biologically active molecule, wherein said biologically active molecule is covalently bonded to said repeat unit; as well as methods for preparing such polymers, particles comprising said polymers and uses of said polymers and particles including use in the treatment of disease.

##STR00001##