Patent GB-700610-A (GB)
Title: Synthetic elastic polymers obtained from di-isocyanate modified polyesters
IPC: C08G18/42
Filed: 1950-01-31
Abstract: Elastomeric products are produced by reacting an anhydrous substantially linear polyester (which may contain a small number of amide groups), of acid number from 20 to 80 and having substantially no free carboxylic groups, with a diisocyanate in an amount from 20 - 250 per cent. preferably 50 - 100 per cent. in excess of that equivalent to the free hydroxy groups of the polyester, and reacting the product with water or a poly functional compound in which the reactive groups are amino or hydroxyl in amount at least equivalent to the free isocyananate groups.  The final product can be stored indefinitely and when required mixed with a small amount of polyisocyanate and shaped and moulded under heat and pressure.  The polyesters are primarily prepared from aliphatic di-carboxylic acids, glycols or hydroxy acids but small quantities of aromatic dibasic acids, aliphatic and aromatic diamines and amino alcohols may also be included in the starting mix.  In examples: (1) a dried glycol - adipic acid polyester of OH value 53 is reacted with 1.5 naphthalene diisocyanate and then with ethanolamine.  The product is mixed with various quantities of 1.5 naphthanlene diisocyanate (a) p  after 1 day (b) after 20 days, and hot pressed for 15 minutes at 150 DEG C. into rubber-like plates.  The mechanical properties of the various products are compared.  (2) similar to (1) using a mixture of glycol - adipic acid and propylene glycol - adipic acid polyesters.  (3) Similar to (2) using in the final stage (a) none, (b) 2 per cent., (3) 3 per cent. (d) 4 per cent. 1.5 naphthalene diisocyanate.  The mechanical properties of the products are compared.  (4) An adipic acid - glycol polyester of OH number 51 is reacted with tolylene diisocyanate and the product with ethanolamine.  After 10 weeks the product is reacted with 3 per cent. 1.5 naphthalene diisocyanate and moulded into golf balls. (5) As in (2) using 2.2 dimethylpropanol amine 1.3 instead of ethanolamine, the product after 3 weeks being reacted with 3 per cent. 1.5. naphthalene diisocyanate and moulded into boot soles. (6) a mixture of propylene glycol and ethylene glycol adipic acid polyesters of OH number 51 are reacted with 1.5 naphthalene diisocyanate and then with p.aminophenyl - ethyl alcohol. (7) As in (2) using trimethylolpropane instead of ethanolamine, the final product being moulded into packing rings.  (8) The mixed polyesters of (2) are reacted with 1.5 naphthalene diisocyanates and the product with quinite.  After incorporating 5 per cent. naphthalene diisocyanate ozone resistant articles are moulded from the mix.  (9) As in (6) using 3 - 31 dichlorobenzidine instead of p.aminophenyl - ethyl alcohol.  After incorporating 3 per cent. naphthalene diisocyanate a bicycle tyre is moulded from the mix. (10) A glycol - adipic acid polyester of OH number 51 is reacted with tolylene diisocyanate and the product with tolylene diamine.  The product is reacted with 2 per cent. tolylene diisocyanate and moulded into plates.  (11) The polyester mix of (2) is mixed with a plasticizer consisting of carbon black and thiodiglycollic acid dibutyl ester and reacted with naphthalene diisocyanate.  The product is reacted with a mixture of ethanolamine and quinite.  After storing the product is reacted with 3 per cent. naphthalene diisocyanate and moulded into buffers.  (12) a mixture of propylene glycol and ethylene glycol adipic acid polyesters are reacted with naphthalene diisocyanate and the product with water.  After 15 days the product is reacted with 2 per cent., 4 per cent., and 6 per cent. naphthalene diisocyanate and moulded into plates, the mechanical properties of which are compared.  The initial polyester need not be strictly linear; e.g. for each 27 mols. of dihydric alcohol 1 mol of trihydric alcohol may be used.  The Specification lists suitable starting materials for the initial polyester and suitable polyisocyanate and hydroxy and/or amino modifying compounds. Specifications 553,733 700,608 and 700,611 are referred to.