申请人:Maestri Francesco
公开号:US20130203904A1
公开(公告)日:2013-08-08
The present invention relates to polypiperidine compounds of polymeric type which are capable of conferring to the polymeric materials, particularly to polyolefins, a high stability against photodegradation and oxidative action of air, belong to the HALS category and have general formula (I):
wherein p is from 3 to 20;
n is from 2 to 12;
R and R
1
, which are the same or different, are selected in the group consisting of hydrogen, linear and branched C
1
-C
12
alkyl groups, alkenyl groups having 3 to 8 carbon atoms and aralkyl groups having 7 to 19 carbon atoms;
X and X
1
, which are the same or different, are selected in the group consisting oxygen and groups of formula (II)
wherein R
2
is selected in the group consisting of hydrogen, linear and branched C
1
-C
12
alkyl groups, cycloalkyl groups having, 5 to 12 carbon atoms and aralkyl groups having 7 to 12 carbon atoms;
A represents a —(CH
2
)
a
— group wherein a is from 2 to 12, with the proviso that a is different from n;
Z is selected in the group consisting of C
1
-C
18
alkyl groups, groups of formula (III)
wherein n, X, X
1
, R and R
1
are as above defined,
and groups of formula (IV)
wherein R is as above defined;
Y represents a substituent selected in the group consisting of the groups of general formula (V)
the groups O—R
4
and S—R
4
,
wherein R
3
and R
4
, which may be the same or different, represent hydrogen, a linear and branched C
1
-C
18
alkyl group, a cycloakyl group having 5 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms or may form, together with the nitrogen atom to which they are linked, a heterocycle containing 5 to 7 carbon atoms;
and the piperidine group (VI)
wherein R and X are as above defined.
The invention further relates to the processes for preparation of the compounds according to the invention.