THF RIM elastomer 

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This is a typical elastomer prepared by RIM injection. Polytetramethylene glycol give improved hydrolytic stability and retention of tensile strength. Because of the improved hydrolytic stability the fungus resistance of the polyether polyurethane is also improved. Although the polyether have poorer light stability than polyesters, the addition of UV light absorber and hindered amine light stabilizer permits to formulated polymers with improved  light stability. The use of aliphatic diisocyanates is required for excellent UV resistance properties.
RIM elastomer
Polytetramethylene glycol 1000 MW (CAS # 25190-06-1) 100
Polytetramethylene glycol 2000 MW (CAS # 25190-06-1) 100
1.4-butanediol (CAS # 110-63-4) 15 45
MDI prepolymer (18.7 % NCO) 121 253
Triethylenediamine 33 % (CAS # 280-57-9) 1.4 2.8
Dibutyltin bis(dodecyl mercaptide) (CAS # 1185-81-5) 0.12
Dibutyltin dilaurate (CAS # 77-58-7) 0.225
Gel time, seconds 3.0
Demold time, minutes 2.0 1.0
Hardness, Shore 78A 52D
Modulus 100 %, psi, (MPa) 675(4.7) 2,060(14.1)
               300 %, psi, (MPa) 1,150 (7.9) 3,300 (22.8)
Tensile Strength,   psi, (MPa) 3,450(23.8) 3,700(25.5)
Elongation, % 750 340
Die C Tear,  pli, (kNm) 460 (81) 660 (116)

Last edited on:

November 16, 2006

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