Patent GB-819104-A (GB)
Title: Synthetic resin compositions and reaction products thereof
Inventor: PEERMAN DWIGHT ELSWORTH
IPC: C08L77/00
Filed: 1957-07-01
Abstract: Coating compositions comprise heat reactive thermosetting phenol-formaldehyde resins and amino-polyamide resins (see Group IV (a)).  In the examples: (1) tin-coated steel plates are coated with a composition of an amino-polyamide resin made from dimerized fat acids and triethylene tetramine and a phenol-formaldehyde resin, said coating being cured by heating; (5) tin-coated steel plate is sprayed with a solution of an amino-polyamide resin and a cresol-formaldehyde resin, said coating being cured by heating; (6)-(18) tin-coated steel plates and glass plates are coated by a blade with solutions containing various phenol-formaldehyde resins and various amino-polyamide resins (e.g. those made from dimerized fat acids and tetraethylene pentamine, the coatings then being cured by heating.ALSO:A hardenable composition comprises a heat-reactive thermosetting phenol-formaldehyde resin and an amino-polyamide resin derived from a polymeric fat acid and an excess of a polyamine of general formula H2N-R-(NHR)n-NH2 where n is less than 6 and R is an alkylene radical, said amino-polyamide resin having an amine number in excess of 50.  The amine number is defined as the number of milligrams of potassium hydroxide equivalent to the free amine groups in one gram of the resin.  Specified polymeric fatty acids are those derived from drying or semi-drying oils or esters thereof, e.g. soya bean, linseed, tung, perilla, cottonseed, corn, sun-flower, safflower and dehydrated castor oil.  Specified polyamines are diethylene triamine, triethylene tetramine, tetraethylene pentamine, bis-trimethylene triamine, tristrimethylene tetramine and dipropylene triamine.  Specified phenols are phenol, cresols, xylenols, p-n-butyl phenol and p-t-butyl phenol.  The compositions may be hardened to foams.  Fillers, e.g. clays, paper and finely-ground metals or abrasives may be included in the compositions.  In the examples: (1) an amino polyamide resin made from dimerised fat acids and triethylene tetramine and a phenol formaldehyde resin are mixed, and (a) heated to form a tough copolymer, (b) coated on tin coated steel plates and cured; (2) the resins of Example (1) are mixed and foamed; (3) an amino polyamide resin as in Example (1) is dissolved in a toluene-isopropanol mixture, mixed with a solution in ethanol of a polyvinyl butyral modified phenol-formaldehyde resin and used to impregnate fibre glass cloth which is bonded under heat and pressure between two aluminium plates; (4) a solution as in Example (3) of an amino polyamide resin made from dimerised fat acids and diethylene triamine is mixed with a phenol-formaldehyde resin, the solution being used for impregnating fibre glass cloths, six of which are laminated under heat and pressure; (5) a solution of an amino polyamide resin and a cresol-formaldehyde resin are mixed and used to coat tin-coated steel plate, the coating then being cured; (6) aminopolyamide resin solutions as in Example (3) and Examples (14 to 18), solutions of resins made from dimerized fat acids and tetraethylene pentamine are blended with phenolic resin solutions and coated on to tin plates or glass, the resin films then being cured; (19) cotton rag paper sheets are dipped into a solution in isopropanol and 2-ethoxyethanol of a cresol-formaldehyde resin and an aminopolyamide resin made from dimerized fat acids and triethylene tetramine, and eleven of them laminated under heat and pressure.