Patent · US Active

UV absorbing chromophores covalently bonded to hyperbranched polymers

US7988953B2 · kind B2 · utility

14Cited by

13References

11Claims

0Family size

Assignee

DSM IP ASSETS B.V. · NL

Inventors

Alexander Poschalko · Birsfelden, CH
Ulrich Huber · Rathenow, DE
Volker Schehlmann · Schifferstadt, DE

Key dates

Filing date	Mar 23, 2005
Grant date	Aug 2, 2011
Priority date	—
Expiry date	Aug 2, 2027

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61K2800/57
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

The invention provides a conjugate comprising a hyperbranched polymer covalently bonded to at least three UV absorbing chromophores having an UV absorption maximum λmax≧270 nm.The conjugate is an effective and safe sunscreen which can advantageously be used in cosmetic compositions.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.