-
Patent Agency Ranking
-
公开(公告)号：DE2451726A1
公开(公告)日：1976-05-06
申请号：DE2451726
申请日：1974-10-31
Applicant: BASF AG
Inventor： VOSS HARRO DIPL CHEM DR
Abstract: The parent patent discloses a process for the controlled delay of the reaction of isocyanate cpds. with polyester-polyols by using polyesterpolyols contg. 0.0005-10 (0.001-5) wt. % of >=1 added aldehyde or ketone. According to the present patent the polyesterpolyols contain, as further additive, a monoamine, in mol. ratio aldehyde or ketone gp. : amino gp. 1:0.1 to 1:1. Used in the prodn. of polyurethane elastomers. Further addn. of monoamines allows use of also volatile aldehydes and/or ketones at higher reaction temps.
-
公开(公告)号：DE2439276A1
公开(公告)日：1976-02-26
申请号：DE2439276
申请日：1974-08-16
Applicant: BASF AG
Inventor： VOSS HARRO DIPL CHEM DR
Abstract: The retardation of the reaction of polyisocyanates (I) with polyester-polyols (II) is achieved by using (II) obtd. by reacting the usual polyester-polyols (III) for polyurethane prodn. with 0.005-0.1 mole/mole OH gps. in (III) of a monoepoxide (IV) of formula: (in which R1 is Me, Et or Ph; R2 is H or Me). The reaction can be retarded without the use of the usual acidic cpds. The reaction time can be regulated up to ca. 300s.
-
公开(公告)号：DE2423071A1
公开(公告)日：1975-12-11
申请号：DE2423071
申请日：1974-05-13
Applicant: BASF AG
-
公开(公告)号：DE2316293A1
公开(公告)日：1974-10-10
申请号：DE2316293
申请日：1973-03-31
Applicant: BASF AG
Inventor： VOSS HARRO DIPL CHEM DR
Abstract: Catalyst free polyester polyols for use in polyurethane compositions are prepared by melt-condensation of polyalcohols and polycarboxylic acids. When the resulting polyol obtains an acid number of 480 or less, selected distillable mono- and/or dialcohols are added and the condensation continued until an acid number of less than one is obtained. By the same process out of specification polyester polyols can be regenerated for polyurethane use.
-
-
-
-
Search Results
5
records
(took 0.019 seconds)
